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    The customer hits the coating with a hammer, and then the coating will dent. The customer said: "Is it because the hardness of your coating is not good. I can't use hardened steel to deform. The coating is knocked into the groove, which means it is not hard enough.
    An important feature of thermal spraying is that they are very brittle. When we communicate with customers, we will remind them that "the coating is not impact resistant". The coating is more suitable for resistance to friction and abrasion, but when friction and abrasion are accompanied by impact and corrosion, we need to carefully consider whether to use the spraying process. Because the impact will damage the coating, but the corrosion will erode the entire coating and the substrate of the product from the damaged location.
    Using a hammer to strike and deform the coating cannot prove any problems.
Here I give a very simple example: we can break one chopstick by hand, but due to the different strength, we cannot break 10 chopsticks at the same time. Most of the paint we spray is only about 0.2mm, what if the spray thickness is 10mm? The author once sprayed the thickest paint to 32mm, which is very hard, but even with such a thick paint, its brittleness has not changed, and it will still break when subjected to a strong impact.
Second, the coating is not wear-resistant
    A customer used an angle grinder to grind our thermal spray coating, and then told me: "The coating you made is not wear-resistant, I can use an angle grinder to grind it away.
Later, I gave this client an "example of water droplets on a stone". I believe everyone can understand this simple fact. In this world, nothing will not wear out because it is not enough to get the job done. There is another problem. The oxide layer on the surface of the coating is polished off, revealing the metallic color, which does not mean that the coating is gone. The tungsten carbide coating will become brighter after polishing. When many customers use it, the coating is smooth and it is said that the coating has disappeared. This analysis is very arbitrary. The main method is to use a spectrometer to analyze whether the coating still exists.
    Remember that we must use scientific methods to judge the hardness, wear resistance and corrosion resistance of the coating to make it reasonable and well-founded. It is not a method that violates regulations.

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