Extra-hardness chrome plating additive and application thereof

Abstract

The invention relates to an extra-hardness chrome plating additive. The extra-hardness chrome plating additive comprises organic compounds containing single carbon atom, rare-earth cerium salts and VIB family oxysalts, wherein the mass ratio of the organic compounds containing the single carbon atom to the rare-earth cerium salts to the VI B family oxysalts is 1-5:0.002-0.1:0.02-0.04. Adding theadditive into the standard chrome plating solution for use, an obtained coating has a high hardness of 1150-1250HV, and meanwhile, the coating is good in brightness and has characteristics of omittingsubsequent mechanical polishing. No halogen family elements such as F are contained in the additive, the covering power and the current efficiency of the plating solution containing the additive arehigh, the plating solution has little corrosion to an anode, the operation process is simple, and the cost is low.

Description

technical field

[0001] The invention belongs to the technical field of electrochrome plating, and relates to an ultra-high hardness chrome plating additive and its application. Background technique

[0002] As early as 1856, the Germans invented the deposition of chromium metal from a chromium solution. It was not until 1926 that Professor C.G.Fh and others in the United States invented the patent for depositing bright chromium from a chromic acid solution containing sulfuric acid, and the chromium plating process was truly real. It is widely used in industrial production; in 1925, Fink and Eldridge proposed the electroplating chromium process, pointing out that CrO 3 and SO 4 2- When the ratio relationship was 100:1, the commercial chrome plating technology was developed, and gradually formed what was later called the standard chrome plating process. However, the standard chromium plating process has the disadvantages of low current efficiency (8%-15%), poor deep plating...

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