Chrome comes in three colors: white, black, and fog.
White Chrome, which we always called "Bright Chrome", is the most popular color in Chrome plating.
Chromium is a kind of silver-white metal with microstrip blue, the relative atomic mass is 51.99, the density is 6.98～7.21g/cm3, the melting point is 1875～1920℃, and the standard electrode potential is Eush/c, -0. 74V, old "/c," -0.41V and P even e+/Cr -1.33V, metal chromium is easily passivated in the air, and a very thin passivation film is formed on the surface, thus showing the precious metal nature.
The chromium plating layer has high hardness, and its hardness can vary within a wide range of 400-1200HV according to the composition of the plating solution and process conditions.
The chrome-plated layer has good heat resistance. When heated below 500 °C, its gloss and hardness have no obvious change. When the temperature is higher than 500 °C, it begins to oxidize and discolor, and when it is higher than 700 °C, the hardness begins to decrease. The friction coefficient of the chrome layer is small, especially the dry friction coefficient, which is the lowest among all metals. So the chrome layer has good wear resistance.
Chromium plating has good chemical stability and is inactive in alkali, sulfide, nitric acid, and most organic acids, but is soluble in hydrochloric acid (such as hydrochloric acid) and hot sulfuric acid. In the visible light range, the reflectivity of chromium is about 65%, which is between silver (88%) and nickel (55%), and because chromium does not change color, it can maintain its reflectivity for a long time, which is better than silver and nickel.
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