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What is chrome plating for piston rod of construction machinery?

作者:     發布日期:2020-06-22

活塞桿

Because of its excellent performance, chromium plating on piston rod has been widely used as the appearance layer and functional coating of protective and decorative plating system, which has been playing an important role in the electroplating industry. With the development of science and technology and people's attention to environmental protection, on the basis of traditional piston rod chromium plating, micro cracks and new technologies such as micro chromium, chromium, loose hole chromium, low concentration piston rod chromium plating, gaoxiao piston rod chromium plating, trivalent chromium plating, rare earth piston rod chromium plating are developed

 

According to the composition and performance of chromium plating liquid for piston rod, the chromium plating liquid for piston rod can be classified as follows.

 

The common chromium plating solution for piston rod is the chromium plating solution for piston rod with sulfate as catalyst. The plating solution contains only chromic anhydride and sulfuric acid, which is simple in composition and convenient in use. It is a widely used piston rod chromium plating solution. The ratio of chromic anhydride to sulfuric acid is generally controlled at 100:1, and the concentration of chromic anhydride varies from 150 to 450 g / L. According to the concentration of chromic anhydride, it can be divided into high concentration (350-500g / L), medium concentration (150-250g / L) and low concentration (50-150g / L) piston rod chromium plating solution. The current efficiency of low concentration chromium plating solution for piston rod is high, and the hardness of chromium layer is also high, but the covering ability is poor. It is mainly used for hard chromium plating, wear-resistant piston rod chromium plating and other functional electroplating. The high concentration plating solution is stable and has good conductivity. Only low voltage is needed during electrolysis, and the covering ability is better than that of dilute solution

 

Chromium plating solution for composite piston rod chromium plating solution for piston rod with sulfuric acid and silicic acid as catalyst. With the addition of silicofluoride acid, the current efficiency, covering ability and bright range of the plating solution are more than 20 points higher than that of the ordinary piston rod chromium plating solution Gaishan, for example, the current efficiency of negative Ji. However, silicon fluoride has a strong corrosive effect on the parts of positive Ji and negative Ji that can not be chrome plated on piston rod and the lead lining of plating bath. Bixu takes certain protective measures. Its lining and positive jizuihao are made of lead tin alloy. This plating solution is mainly used for chromium plating of piston rod.

 

The chromium plating solution of piston rod with strontium sulfate and potassium silicate as catalyst is adjusted automatically. In a certain temperature and a certain concentration of chromic acid solution, strontium sulfate and potassium silicofluoride have precipitation and dissolution equilibria respectively. If there is solubility product constant KSP, i.e., [SO42 -] or [sif62 -] concentration Zengda in the solution, the corresponding ion concentration product becomes larger than the solubility product constant, If the concentration of [SO42 -] or [sif62 -] in the solution is insufficient, SrSO4 or K2SiF6 in the tank will be dissolved until the corresponding ion concentration product is equal to its solubility product. Therefore, the concentration of [SO42 -] or [sif62 -] in the plating solution can be adjusted automatically by dissolving precipitation balance when the temperature of the plating solution and the concentration of chromic anhydride are fixed, which will not change with the continuous plating process. The bath has the advantages of high current efficiency (270A), wide range of allowable current density (zuigao80 ~ 100A / DM2), good dispersion and covering ability of the bath, and fast deposition speed, so it is also called "high-speed automatic piston rod chromium plating". However, the plating solution is very corrosive.

快速活塞桿鍍鉻

Because of its excellent performance, chromium plating on piston rod has been widely used as the appearance layer and functional coating of protective and decorative plating system, which has been playing an important role in the electroplating industry. With the development of science and technology and people's attention to environmental protection, on the basis of traditional piston rod chromium plating, micro cracks and new technologies such as micro chromium, chromium, loose hole chromium, low concentration piston rod chromium plating, gaoxiao piston rod chromium plating, trivalent chromium plating, rare earth piston rod chromium plating are developed

 

According to the composition and performance of chromium plating liquid for piston rod, the chromium plating liquid for piston rod can be classified as follows.

 

The common chromium plating solution for piston rod is the chromium plating solution for piston rod with sulfate as catalyst. The plating solution contains only chromic anhydride and sulfuric acid, which is simple in composition and convenient in use. It is a widely used piston rod chromium plating solution. The ratio of chromic anhydride to sulfuric acid is generally controlled at 100:1, and the concentration of chromic anhydride varies from 150 to 450 g / L. According to the concentration of chromic anhydride, it can be divided into high concentration (350-500g / L), medium concentration (150-250g / L) and low concentration (50-150g / L) piston rod chromium plating solution. The current efficiency of low concentration chromium plating solution for piston rod is high, and the hardness of chromium layer is also high, but the covering ability is poor. It is mainly used for hard chromium plating, wear-resistant piston rod chromium plating and other functional electroplating. The high concentration plating solution is stable and has good conductivity. Only low voltage is needed during electrolysis, and the covering ability is better than that of dilute solution

 

Chromium plating solution for composite piston rod chromium plating solution for piston rod with sulfuric acid and silicic acid as catalyst. With the addition of silicofluoride acid, the current efficiency, covering ability and bright range of the plating solution are more than 20 points higher than that of the ordinary piston rod chromium plating solution Gaishan, for example, the current efficiency of negative Ji. However, silicon fluoride has a strong corrosive effect on the parts of positive Ji and negative Ji that can not be chrome plated on piston rod and the lead lining of plating bath. Bixu takes certain protective measures. Its lining and positive jizuihao are made of lead tin alloy. This plating solution is mainly used for chromium plating of piston rod.

 

The chromium plating solution of piston rod with strontium sulfate and potassium silicate as catalyst is adjusted automatically. In a certain temperature and a certain concentration of chromic acid solution, strontium sulfate and potassium silicofluoride have precipitation and dissolution equilibria respectively. If there is solubility product constant KSP, i.e., [SO42 -] or [sif62 -] concentration Zengda in the solution, the corresponding ion concentration product becomes larger than the solubility product constant, If the concentration of [SO42 -] or [sif62 -] in the solution is insufficient, SrSO4 or K2SiF6 in the tank will be dissolved until the corresponding ion concentration product is equal to its solubility product. Therefore, the concentration of [SO42 -] or [sif62 -] in the plating solution can be adjusted automatically by dissolving precipitation balance when the temperature of the plating solution and the concentration of chromic anhydride are fixed, which will not change with the continuous plating process. The bath has the advantages of high current efficiency (270A), wide range of allowable current density (zuigao80 ~ 100A / DM2), good dispersion and covering ability of the bath, and fast deposition speed, so it is also called "high-speed automatic piston rod chromium plating". However, the plating solution is very corrosive.

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