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Search Results - Corrosion

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Corrosion means the breaking down of essential properties in a material due to chemical reactions with its surroundings. In the most common use of the word, this means a loss of electrons of metals reacting with water and oxygen. Weakening of iron due to oxidation of the iron atoms is a well-known example of electrochemical corrosion. This is commonly known as rust. This type of damage usually affects metallic materials, and typically produces oxide(s) and/or salt(s) of the original metal. Corrosion also includes the dissolution of ceramic materials and can refer to discoloration and weakening of polymers by the sun's ultraviolet light.

Most structural alloys corrode merely from exposure to moisture in the air, but the process can be strongly affected by exposure to certain substances (see below). Corrosion can be concentrated locally to form a pit or crack, or it can extend across a wide area to produce general deterioration. While some efforts to reduce corrosion merely redirect the damage into less visible, less predictable forms, controlled corrosion treatments such as passivation and chromate-conversion will increase a material's corrosion resistance.

One way to understand the structure of metals on the basis of particles is to imagine an array of positively-charged ions sitting in a negatively-charged "gas" of free electrons. Coulombic attraction holds these oppositely-charged particles together, but the positively-charged ions are attracted to negatively charged particles outside the metal as well, such as the negative ions (anions) in an electrolyte. For a given ion at the surface of a metal, there is a certain amount of energy to be gained or lost by dissolving into the electrolyte or becoming a part of the metal, which reflects an atom-scale tug-of-war between the electron gas and dissolved anions. The quantity of energy then strongly depends on a host of variables, including the types of ions in a solution and their concentrations, and the number of electrons present at the metal's surface. In turn, corrosion processes cause electrochemical changes, meaning that they strongly affect all of these variables. The overall interaction between electrons and ions tends to produce a state of local thermodynamic equilibrium that can often be described using basic chemistry and a knowledge of initial conditions

Factors such as relative size of anode (smaller is generally less desirable), types of metal, and operating conditions (temperature, humidity, salinity, etc.) will affect galvanic corrosion. The surface area ratio of the anode and cathode will directly affect the corrosion rates of the materials.

Showing 1 to 25 of 119 Articles matching 'Corrosion' in related articles.
Pages: 1 | 2 | 3 | 4 | 5 | Next >>

1. Gold jewelry...an invaluable showpiece adorning our personality
November 17, 2008

Envisioned as a symbol of wealth and status, gold jewelry are the most precious forms of jewelry. Crafted to suit nearly every occasion, gold jewelry reflect aestheticism and elegance that are beyond comparison. The softness of pure gold makes it ideal to be alloyed with base metals for making gold jewelries. Gold is resistant to wear and corrosion, and therefore, the jewelry items made of gold are never out of fashion. It can be moulded into any desired shape and pure gold does not react with other elements, thus avoiding any tarnish on the pieces. The most common forms of gold jewe... (read more)

Author: Rajni Sharma

2. Platform scales measure flow rates
November 14, 2008

It is very common to use a platform scale to weigh the contents of a tank or drum of liquid. This type of industrial scale includes a platform that is large enough to accommodate a 55 gallon drum, or even larger tanks. Typically the digital scale will incorporate four load sensors, so that the position of the tank on the platform is not critical. Good quality platform scales use stainless steel load sensors for maximum ruggedness, reliability and corrosion resistance. Generally, a drum scale can have a capacity of 1000 lb. This will handle virtually any type of liquid in a 55 gallon drum.... (read more)

Author: Chris Carter

3. Motorcycle Riding Tips - Lube that Chain
November 11, 2008

Caring for your motorcycle chain won't just prolong its life; it will mean your bike will ride as smoothly as it should too. Chain lubrication should be carried out roughly every 500km or so, so if you're a weekday commuter then simply make it part of your weekly maintenance schedule, while dirt bike riders should give it a once over each and every ride. A well lubricated chain will ward off corrosion, run quieter and last longer, and it will prolong the life of your sprockets too, so it's well worth the effort. A variety of different brands of chain spray are available, but go for a... (read more)

Author: Ted Brumby

4. Why ARMOLOY® Chromium Protective Coatings
November 07, 2008

Armoloy of Western Pennsylvania offers wear coatings and dry lubricants [Diamond Chromium Coating (98Rc) which exceeds the boundaries of standard coatings, and Thin Dense Chromium Coating (78RC), a low-temperature, multistate surface finishing process] that will solve corrosion and wear problems, saving both time and money. Unprotected surfaces of major ferrous and nonferrous base metals are subject to several forms of corrosion. Combined with fatigue, corrosion is the significant contributor to the breakdown of the metals. Corrosion is a natural process which reduces the binding... (read more)

Author: Matthew Mckernan

5. Keep your garage floor clean with a clean park mat
November 06, 2008

Concrete beat Most garages have concrete flooring nowadays. But unfortunately, these are the kind of floors that are difficult to protect against the elements. Not only do we have the problems of corrosion from engine oils and acids, but also from the natural elements such as dirt or water from rain and snow. Fortunately nowadays, there are now quite a few options and other solutions available to help solve these problems. One of them is the garage floor clean park mat. Most mats available on the market today are resistant to liquid spills which include oils, acids and water. On top of that, ... (read more)

Author: Hedin Johan

6. Coating aluminum
October 30, 2008

Treatment of Die Casting Die Surfaces To Retard Heat Checking. The life of aluminum and magnesium die castings dies can be extended considerably with the Process. This already has been proven using the coating on dies, especially those affected by heat checking. When the treatment is applied early in the life of the die, the number of castings made from the die can be increased and more profits generated. Heat checking is a common cause of failure in die casting dies made of steel(I.e.: H-13) and is commonly attributed to the over stressing of thermal fatigue of the steel used. This ther... (read more)

Author: Matthew Mckernan

7. Welding Copper and Info on Welding Copper
October 30, 2008

Copper alloys and copper are often used in many environments where manufacturing is done. It is a material that resists corrosion, can be easily fabricated, is strong and resists fatigue. Also, it has both thermal and electrical conductivity. Copper is a metal that is also resistant to sparks, has a distinctive color and is resistant to wear when it is used with other metals. Arc welding uses a lot of copper in most of the various types of arc welding including gas metal, plasma or submerged arc welding. Copper also uses a shielding gases in some of the arc welding processes and it is us... (read more)

Author: William Walley

8. Welding Stainless Steel and Info on Welding Stainless Steel
October 30, 2008

Stainless steel resists corrosion and it is one of the iron based alloys. They usually do not rust and they are able to withstand certain types of liquids, chemicals or gases without corroding. They are versatile in their ability to withstand high temperatures and have some iron in them. Stainless steel melts at a lower temperature, is more resistant to electricity and transfers heat at a lower level. They also expand at a higher rate when heated than other metals. This can cause problems when welding because it has different reactions than other metals. Stainless steel reacts diff... (read more)

Author: William Walley

9. Custom plastic products and rotational molding
October 25, 2008

Custom Molded Plastic Product Plastic is a manufactured goods that is used expansively in industrial applications because of its anti-corrosion properties, its durability, its versatility, its low cost, its chemical resistance, its insulating properties, and its flexibility, etc. Plastic materials refer to the entire range of plastic and its various compounds that are used in a wide variety of industrial processes. Plastic materials can be bought in many different forms such as sheets, rods, tubes, film, pellets, and other forms. These plastic components are used in an assortment of ... (read more)

Author: Robert Bell

10. Metal Patinas and Finishes and Metal Art
October 24, 2008

A work of metal art is not complete when the fabrication is done. Finishing the art work is essential not only to complete the effect and enhance its appeal, but also to protect the metal form discoloration, rust and corrosion. Modern technology has provided a variety of options for applying patinas and finishes. Many patinas and finishes are for use only with specific metal and alloys. Among the varieties available are: • Clear acrylic finishes are transparent coatings given to works of metal art to protect them from the effect of water and environmental pollution (such as acid rain or a... (read more)

Author: Ivan Smith

11. Different types of metal finishing chemicals
October 21, 2008

Metal finishing alters the surface of metal products to enhance corrosion resistance, wear resistance, electrical conductivity, electrical resistance, reflectivity and appearance, torque tolerance, solder ability, Tarnish resistance, chemical resistance, and hardness. Electrolytic plating, electro less plating, and chemical & electrochemical conversion processes are typically used in the industry. Types of metal finishing processes are electroplating, electro less plating, chemical and electrochemical conversion, cladding, and case hardening, dip/galvanized coatings, electro polishing, a... (read more)

Author: Mari milian

12. Acid Reflux Symptoms
October 08, 2008

In order to understand Acid Reflux Symptoms,you first need tounderstand the disease itself. This is the movement of acid and fluidup the oesophagus. Its as a result of a faulty sphincter thatconnects the stomach and the oesophagus. When we eat food, thestomach lining produces some acids to digest it. The stomach liningis protected by a mucus cover from corrosion by the acids. Theoesophagus does not have a mucus membrane thus if acid refluxes intoit, it can get corroded.The symptoms vary with individuals and can also vary in intense.Some people's quality of life is greatly affected by the disea... (read more)

Author: angela mwema

13. Acid Reflux Relief
October 08, 2008

Acid reflux is the movement of acid and fluids up the esophagus.This is the track that takes food to the stomach. The reflux is as aresult of an esophageal sphincter than loosely fits. Acid is producedby the stomach lining to digest food. The stomach has a mucus liningthat protects it from corrosion by the acid. The esophagus does nothave this mucus membrane and can therefore get corroded. Constant acid reflux is detrimental to your health. The mainindicator of acid reflux is the presence of a heartburn. This isusually a burning pain in the chest rising to the throat. Acid reflux relief shoul... (read more)

Author: angela mwema

14. Headlight Restoration - A Viable Business With Substantial Profits
October 07, 2008

Headlight Restoration - A Viable Business With Substantial Profits. The need for headlight restoration has exploded in recent years due to the rising cost of replacing dull and foggy lenses. Every since glass lenses were replaced with the more stylish designs made of types of plastic, corrosion has been a nuissance. Headlight lens corrosion not only effects the aesthetic value of the vehicle but is a safety issue as well. Therefore a headlight restoration service provides a cosmetic solution as well as a mechanical solution. Providing a single solution for two probelms has made headlight rest... (read more)

Author: Benjamin Smith

15. SWRO Design and Energy Recovery Part 3: Major Component Selection
October 07, 2008

The sand screens and micron filters were selected because of the durable and corrosion resistant fiberglass and PVC construction. The specific model of Eden micron filters was chosen to maintain the filter element flux at approximately 3.3 gpm/per 10" equivalent. Due to the relative remoteness of the installation site, multistage-centrifugal, high-pressure pumps have been selected for their reliability, availability of parts, economics of operation and easy maintenance. Centrifugal pumps in general are smoother, quieter, and require less ancillary equipment (i.e. pulsation dampeners) tha... (read more)

Author: Zack Fair

16. Coating linear bearing
October 07, 2008

Armoloy TDC is Increasing Life and Improving Performance of Linear Bearings in the Following Industries: Machine Tools Food Processing Paper Manufacturing Clean Room Pharmaceutical Robotics Added Lubricity The unique nature of the Armoloy TDC process will enhance the lubricity of your Armoloy coated rails. This added lubricity is especially important in applications requiring minimum to no lubricating agents being present in the processing line. Increased Corrosion Resistance Armoloy will improve the corrosion resistance of standard linear rails in most chemical or ... (read more)

Author: Matthew Mckernan

17. The Elegance of Wrought Iron Patio Furniture
October 04, 2008

Nothing can quite bring the same elegance to your patio or deck as wrought iron patio furniture. Wrought iron is the highest quality and the purest form of iron available in patio furniture. When you purchase wrought iron patio furniture you are getting furniture that is resistant to corrosion, and void of the impurities that are in many other types of metals. Wrought iron patio furniture comes in several different designs, and its high quality and beauty brings an air of charm to your patio living space. Not only is wrought iron patio furniture weather resistant, which makes it perfect f... (read more)

Author: Robert Bell

18. Rust Inhibitor Paints To Save Iron From Corroding
September 25, 2008

ermite spoils wood, while rust brutally corrodes and spoils iron, one of the toughest metals on earth. The very term produces a completely irritating effect in the minds of those who want their things to always stay strong, shiny and long-lasting. Even a coating of paint on iron products fails to save iron. In this age if machineries it has become all the more important to look for ways to save iron from corroding. Till some years back there was no effective way to treat rust or prevent it. However, after years of struggles and experimentations, scientists have finally come up with rust inhibi... (read more)

Author: David Ciglar

19. How ceramic balls are superior...................................
September 24, 2008

Ceramic balls got extreme abrasion and corrosion resistance. Their low coefficient of thermal expansion have extended their utility in the bearings, as with the increase of heat they resist bearing friction, as they absorbs less heat therefore saves the cost of coolant which is normally required otherwise. Not only is this light weight of ceramic balls in comparison to steel balls help them in getting comparatively low centrifugal force which is inverse to result high speed while rotation. Ceramic bearings got one more advantage over steel balls of being chemically non reactive, whic... (read more)

Author: Shraddha Avasthi

20. Different types of metal plating chemicals
September 19, 2008

Plating describes surface covering where a metal is deposited on a conductive surface. Plating is used for many purposes, some of them are to decorate objects, corrosion inhibition, solder ability, hardens, improves wear ability, reduce friction, improve paint adhesion, alter conductivity, radiation shielding and for many other purposes. Different types of CA metal plating chemicals are gold plating, silver plating, rhodium plating, chrome plating, zinc plating, tin plating, alloy plating, composite plating, cadmium plating, copper plating, nickel plating, brass plating. Gold plating mea... (read more)

Author: Mari milian

21. Fiberglass and Plastic Blowers and Fans by Tenderall Fan Co.
September 17, 2008

Tenderall Fan Co. is a supplier of plastic and fiberglass fans and blowers for industry applications where aggressive media must be moved. Plastic fans include polypropelene, PVC, PVDF, fire retardant and UV resistant PPs. Applications for Corrosion and Chemical Resistant Fans include: * University, Medical Research, Defence Labs, Fume Hoods OEMs, Pharmaceutical Labs On most campuses there is a certain number of fume hoods that are used for various acids testing to break down materials for analysis. HCl and Perchloric Acid are the ones used most commonly. Fume hoods and Chemic... (read more)

Author: Oleg Chetchel

22. System Recruitment is Right Firm to Help You Find the Job you Want.
September 12, 2008

At System Recruitment we have a highly qualified and motivated staff of recruitment experts who can help you find the jobs you want in many fields. This includes such areas as IT jobs, SQL jobs, Sales jobs, and Programming Jobs. We can also locate Engineering jobs such as those of Corrosion Engineer and Environmental Engineer. We are a United Kingdom based firm located in Birmingham and we have been in the recruitment business since 2000. As a result we have established a top reputation with many companies throughout the UK. This puts us in the position of being able to help you, the job... (read more)

Author: Mark Doherty

23. STEEL BEARING BALLS.................................
September 12, 2008

THIS IS SMALL, ROUND, LOOKS LIKE A BALL, BUT ACTUALLY IS A BASE OF THE MOTION OF BEARINGS WIDELY USED IN MECHANICAL, NOW ALSO IN CIVIL, ELECTRICAL AND SPACE APPLICATIONS. These bearings which were earlier only formed of steel, brass are now become trendy too. With the influx of latest and advance technology our new engineering boon is ceramic balls. Now the question comes on the need of the invention of ceramic balls. Reasons for giving ceramic balls special preference:- Ceramic balls got extreme abrasion and corrosion resistance. Their low coefficient of thermal expansion have... (read more)

Author: Shraddha Avasthi

24. Understanding Desalters
September 05, 2008

Fuel oil can be contaminated as a result of seawater being delivered from a barge at the time of loading. In some cases ballast water or incorrect valve operations can contribute to high levels of seawater contamination. A high concentration of seawater, which not only contains a range of metals, but also sodium, will contribute to a higher ash content than fuels containing non-seawater. It is well known that sodium compounds present in fuel oils, can combine with the vanadium in fuels to cause corrosion of exhaust valves. Vanadium and sodium oxidise during combustion to form semi-li... (read more)

Author: Robert Bell

25. Stainless Steel and Corrosion
September 02, 2008

In general, chromium is the element providing much of the corrosion resistant quality to stainless steel by combining with oxygen to form an invisible protective film on the surface called chrome-oxide. See special note below for Designer Series (powder coated) stainless steel products. Other stainless alloys may further improve corrosion resistance with higher levels of chromium (to improve the stability of the chrome-oxide film), nickel (to improve the resistance of the film in some acid environments) or by the addition of molybdenum and chromium (to increase resistance to chloride pene... (read more)

Author: steve merillat

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