12/15/2023 0 Comments Zama chromium plating![]() ![]() Black chrome coating has good heat resistance and will not change color below 300☌. And the wear resistance of black chrome coating is 2 to 3 times higher than bright nickel at the same thickness The corrosion resistance of black chrome plating is same as the ordinary chrome plating, and which mainly depends on the thickness of the intermediate layer. Some of them could be as high as 200-800μm.īlack chrome coating: Which has a black color, uniform gloss, good decoration, good matting and high hardness (130-350HV). Generally, the thickness of hard chromium plating is 5-50μm, but it can also be determined according to needs. Hard chromium plating can also be used to repair the dimensional tolerances of worn parts. Such as cutting and drawing tools, pressing molds and casting molds of various materials, bearings, shafts, gauges, gears, etc. ![]() Hard chromium plating (abrasion-resistant chromium): It has extremely high hardness and wear resistance, which can extend the service life of workpieces. Such as the parts of automobiles, bicycles, sewing machines, clocks, instruments, and daily hardware etc. This type of coating is widely used in the protection and decoration. And it can be exposed in the atmosphere for a long time, without color changes. The polished product can obtain a silver-blue mirror luster if the surface plated with decorative chrome. Usually, the decorative chromium is used as the outermost layer of multi-layer electroplating, for the protection purpose.Ī thick enough intermediate layer must be plated on the zinc base or steel substrate first, then plate a thin chromium layer of 0.25-0.5μm on this bright intermediate layer. The plating layer is thin, bright and beautiful. Protection-decorative chromium plating: Protection-decorative chromium plating is commonly known as decorative chromium. Wear resistance chrome plating/ Hard chrome plating 50-100μm There are two types of chrome plating, one is decorative chrome and the other is hard chrome plating. Because chromium does not change color, it can maintain its reflectivity for a long time, which is better than silver and nickel. In the visible light range, the reflectivity of chromium is about 65%, which is between silver (88%) and nickel (55%). The chromium coating has no effect in alkali, sulfide, nitric acid and most organic acids, but it can be dissolved in hydrochloric acid (such as hydrochloric acid) and hot sulfuric acid. The chromium plating layer has good chemical stability. Therefore, the chrome-plated layer has good wear resistance. The friction coefficient of the chrome layer is small, especially the dry friction coefficient, which is the lowest one among all metals. And the hardness of the chromium coating will start to decrease when the temperature exceeds 700℃. When the temperature above 500℃, it will start to oxidize and discolor. ![]() When it’s heated and the temperature is below 500℃, the gloss and hardness of chromium coating won't have obvious change. The chromium-plated layer has a good heat resistance. Which is depending on the composition of the plating solution and process conditions. The chromium-plated layer has a very high hardness, and its hardness can vary in a wide range(400-1200HV). Chrome plating is the process which electroplates a thin chromium layer on other metals. Usually, our customer will request us to apply chrome plating service on the polished steel parts.
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