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The chromate coating acts as paint does, protecting the zinc from white corrosion, thus making the part considerably more durable, depending on the chromate layer's thickness. [ 8 ] [ 9 ] [ 10 ] The protective effect of chromate coatings on zinc is indicated by color, progressing from clear/blue to yellow, gold, olive drab and black.
The earliest known use of chrome yellow in a painting is a work by Sir Thomas Lawrence from before 1810. [12] The first recorded use of chrome yellow as a color name in English was in 1818. [ 13 ] The pigment was also widely used in industrial applications, such as in the production of paint, plastics, and ceramics.
Chemical coloring of metals is the process of changing the color of metal surfaces with different chemical solutions. The chemical coloring of metals can be split into three types: electroplating – coating the metal surface with another metal using electrolysis. patination – chemically reacting the metal surface to form a colored oxide or ...
Zinc chromate's main use is in industrial painting as a coating over iron or aluminium materials. [8] It was used extensively on aircraft by the US military, especially during the 1930s and 1940s. It is also used in a variety of paint coatings for the aerospace and automotive industries. [ 9 ]
Chrome plating (less commonly chromium plating) is a technique of electroplating a thin layer of chromium onto a metal object. A chrome plated part is called chrome , or is said to have been chromed .
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In the 1800s, the product was used to impart a bright yellow color to some types of candy. [7] It is used (illegally) to enhance the color of certain spices, particularly turmeric, [8] [9] particularly in Bangladesh. [10] [11] Unlike other lead-based paint pigments, lead chromate is still widely used, especially in road marking paint. [12]
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