Recently, many customers asked me, if the stainless steel screws and carbon steel screws can be distinguished by the naked eye? Today I will tell you about it from the following aspects to distinguish:
1. By color:
A. stainless steel screw is the primary color of iron, the material is stainless steel, the color of stainless steel is mainly iron and carbon alloy, so the color is close to the color of iron;
B, galvanized screw surface includes white zinc, color zinc(yellow zinc), black zinc, etc., so galvanized screw color is generally white, colorful, black; Nickel plated screwcolor is associated with nickel nickel, generally present is very bright silver;
2. Distinguish with magnets: stainless steel generally does not have magnetic, can not be absorbed by the magnet, will be stainless steel screws, carbon steel screws can be absorbed by the magnet.
3. Distinguish with oxidizer: Nickel has a strong passivative ability, when electroplating on the surface can quickly generate a layer of very thin passivation, so the surface of carbon steel with nickel plated screw has a layer of passivative film, the surface of carbon steel galvanized screw is a layer of zinc, stainless steel surface has nothing, can be distinguished with a strong oxidizer.
4. With strong acid and alkali distinguish: stainless steel components include chromium and nickel, has a strong corrosion resistance, not by strong acid and alkali corrosion, carbon steel nickel plated screw surface has a layer of passivative film, by strong acid and alkali erosion is slow, carbon steel galvanized screw is corroded the fastest
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