Metal Corrosion - How Do You Choose The Right Preventive Coating?

We define metal corrosion as chemical (or electrochemical) reactions occurring between the metal and the environment, which causes a negative impact on the metal's surface properties.

So, what's the secret to making corrosion resistant coatings work? Easy, really. Once you understand the types of metal corrosion and their contributing properties.

Fretting-- visible through pits, grooves, or debris relating to oxidation, occurring at the asperities or "peaks" of contact surfaces. An example is vibration, which is the result of load in the presence of repeated relative motion.

Galvanic-- seen by pits, holes, or oxidation products, is the result of localized corrosion between two dissimilar metals. Here, one metal corrodes faster than it would alone, while the second metal corrodes slower than it would alone. Often, this type of corrosion is confused with coupled metals exhibiting increased corrosion based on differences in their electromotive force potentials.

Uniform-- manifested by uniform, measurable material loss over a larger surface area, which continues until failure.

Pitting-- is a localized form of corrosion. Often difficult to detect, this type is considered more dangerous to design against. Pitting corrosion is initiated by local chemical or mechanical damage of protective oxide films or non-metallic inclusions, theoretically forming a "battery" between an abnormal anode or cathode site.

Other forms of it such as Intergranular, Exfoliation, Stress Corrosion, and Hydrogen Embrittlement, can also result in localized cracking, severe loss in ductility, and increased residual tensile stresses. Failure, here, is typically catastrophic.

Now that you recognize the corrosion mechanisms, what are the best protective coatings?

Look at the environment. Consider temperature, chemical or atmospheric condition, time of exposure. Is the contact intermittent or continuous? Are the corrosives in liquid or vapor form?

You see, it's not just about finding a non-reactive coating. It is about creating a barrier. And that means eliminating surface porosity. Typically, the thicker the coating, the better the permeation strength and better its performance. This will be true for any coating choice. So, how do you choose the right corrosion preventive coating? Easy. Once you understand your actual mechanism for metal corrosion.

Want more information? Need help with your surface engineering? We care! Just visit us at:

Metal Corrosion

William Gunnar, a degreed scientist, researcher, engineer, and friend, has helped thousands of 'best of class' product designers and equipment manufacturers -- for nearly 20 years now -- surface engineer with coatings for success.

His publication, Industrial Coatings World, brings wisdom, honesty, leading edge information, and no nonsense advice to thousands weekly. Put together by some of the world's leading experts in coatings and manufacturing, his FREE newsletters are truly must-reads for those who want to be 'in-the-know'.

PEEK Corrosion Resistant Coating? Here's A 'PEEK' At This New Engineered Thermplastic

We define metal corrosion as chemical (or electrochemical) reactions occurring between the metal and the environment, which causes a negative impact on the metal's surface properties.

So, what's the secret to making corrosion resistant coatings work? Easy, really. Once you understand the types of metal corrosion and their contributing properties.

Fretting-- visible through pits, grooves, or debris relating to oxidation, occurring at the asperities or "peaks" of contact surfaces. An example is vibration, which is the result of load in the presence of repeated relative motion.

Galvanic-- seen by pits, holes, or oxidation products, is the result of localized corrosion between two dissimilar metals. Here, one metal corrodes faster than it would alone, while the second metal corrodes slower than it would alone. Often, this type of corrosion is confused with coupled metals exhibiting increased corrosion based on differences in their electromotive force potentials.

Uniform-- manifested by uniform, measurable material loss over a larger surface area, which continues until failure.

Pitting-- is a localized form of corrosion. Often difficult to detect, this type is considered more dangerous to design against. Pitting corrosion is initiated by local chemical or mechanical damage of protective oxide films or non-metallic inclusions, theoretically forming a "battery" between an abnormal anode or cathode site.

Other forms of it such as Intergranular, Exfoliation, Stress Corrosion, and Hydrogen Embrittlement, can also result in localized cracking, severe loss in ductility, and increased residual tensile stresses. Failure, here, is typically catastrophic.

Now that you recognize the corrosion mechanisms, what are the best protective coatings?

Look at the environment. Consider temperature, chemical or atmospheric condition, time of exposure. Is the contact intermittent or continuous? Are the corrosives in liquid or vapor form?

You see, it's not just about finding a non-reactive coating. It is about creating a barrier. And that means eliminating surface porosity. Typically, the thicker the coating, the better the permeation strength and better its performance. This will be true for any coating choice. So, how do you choose the right corrosion preventive coating? Easy. Once you understand your actual mechanism for metal corrosion.

Want more information? Need help with your surface engineering? We care! Just visit us at:

Metal Corrosion

William Gunnar, a degreed scientist, researcher, engineer, and friend, has helped thousands of 'best of class' product designers and equipment manufacturers -- for nearly 20 years now -- surface engineer with coatings for success.

His publication, Industrial Coatings World, brings wisdom, honesty, leading edge information, and no nonsense advice to thousands weekly. Put together by some of the world's leading experts in coatings and manufacturing, his FREE newsletters are truly must-reads for those who want to be 'in-the-know'.

Car Rust Removal and Repair, Automotive Undercoating and Paint

Thinking of how to remove the rust, this is accrued on your favorite car. Whether it's the top brand or a second hand one we all care for our cars so much. Car rust removal has become a matter of concern for car owners all over the world. We want to protect our cars in whatever way we can. And we are so concerned about it that whenever we read an advertisement here and there we tend to think that so and so company is offering us a good solution to get rid of this nuisance. We keep on fighting the battle of rust prevention without getting any foolproof results.

Car rust removal is a process by which the rust can be removed from our cars. But no method does it completely. We spend lots of money in order to get rid of this irritant called rust. But no results, all the companies just make false promises and provide nothing workable on rust prevention techniques. All our money is spend just in the various ineffective methods, which claim to serve our purpose. Sometimes we have to face major monetary loses incurred due to these companies. We fall a trap to these companies who just don't give any solution instead in the long run they create problems for us. The solutions are not only expensive but are ineffective also. They don't offer a good solution, which can solve our problems.

So we want a product that offers corrosion control in a foolproof manner. Rust Bullet is guaranteed to solve this problem and prevent rust from coming any further. It gives you a long lasting remedy, which gets you the value of your money. The product is a tried and tested formula that provides you the full value of your money. We take the responsibility of corrosion control because we believe in giving you the best results. Rust prevention is an area in which we excel. It's a one-stop shop for your solution to rust removal. It's also scientifically tested to not to harm your car. It's an ideal rust preventative solution. So don' let rust kill your car as this will kill rust.

Car rust is something to which all of us are seeking answers. Rust Bullet comes as a solution that gives the answer by providing a rust proof solution in a bulletproof manner.

He is well known Aut Author writing about Rustpaint on www.rustbullet.com