Property Inspection Methods of corrosion-resistant coating

Corrosion is a process of material (especially the metal material) damaging or performance deterioration which issues chemical, electrochemical reaction or physical dissolve in the ambient medium. Corrosion-resistance coating is born to withstand the phenomenon, laboratory experiment and field coupon test are two methods to inspect property of materials’ corrosion resistance.

1. There are many laboratory experiment test methods for thermal spray coating corrosion testing, such as outdoor exposure test, Liquefied dipping experiment, salt spray test, Damp and hot corrosion test, Sulphur dioxide industrial atmosphere corrosion test, Hot corrosion experiment, electrochemical testing. Field coupon test is aiming at working environment of the workpiece, choosing environmental medium and the same conditions of field, such as atmosphere, seawater, fresh water, soil. All kinds of chemical mediums and additional piece going along with the equipment operation to identify its corrosion resistance. It takes a long time to get the conclusion by the data of field coupon testing, but through intensive laboratory experiment, we can know coating working environment and simulating the coating corrosion resistance in its actual use in a short time. So laboratory corrosion testing is the better choice for production testing.

（2）Field coupon and simulation are usually on the basis of laboratory experiments, it’s a further testing for actual corrosion of material. The evaluation of corrosion test results, result of macroscopic and microscopic observation is considered. The uniform corrosion is mainly measured by corrosion rate, the corrosion rate is the loss of material in unit time and on unit area.
To my knowledge, Agglomerated and Sintered WC Co Tungsten Carbide Thermal Spray Powder is the best corrosion-resistant spray powder.

Related articles
 Our advanced surfacing technology
Performances and classifications of spraying coating
Classifications of thermal spraying technology (part one)
Classifications of thermal spraying technology (part two)
Cemented carbide coating