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A kind of technological method of improving the binding force of chrome-plated layer

A process method and combined force technology, applied in the field of electroplating processing, can solve the problems of peeling, bubbling, and the failure of the electrodeposition process to achieve the effect of ensuring long service life and improving quality

Active Publication Date: 2019-07-09
SINOPEC YANGZI PETROCHEM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in some metal materials resistant to medium and high temperature, a certain amount of Cr element is generally contained. The higher content of Cr element is easy to oxidize, and can quickly form various complex oxide films on the surface of the steel, and affect the coating and coating during the plating process. The bonding force of the substrate, when serious, even makes the electrodeposition process not go smoothly, and the plating layer prepared by the ordinary chrome plating process often has phenomena such as peeling and bubbling, which seriously affects the product quality

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  • A kind of technological method of improving the binding force of chrome-plated layer
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  • A kind of technological method of improving the binding force of chrome-plated layer

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] The base material is 20CrMo steel. The specific coating preparation process is as follows:

[0022] 1) High-pressure shot peening on the plated surface, shot peening pressure 0.5MPa, projectile diameter 0.2mm, time 10min.

[0023] 2) Chemically polish the plating surface to make the surface roughness above Ra0.4.

[0024] 3) Use chemical cleaning to remove oil, cleaning agent: NaOH 80g / L, NaOH 3 PO 4 30g / L, Na 2 SiO 3 10g / L, cleaning temperature 85℃, time 10min.

[0025] 4) Rinse with deionized water.

[0026] 5) Weak acid activation, activation solution: 5~10g / L H 3 PO 4 , 5-10g / L H 2 SiF 6 , 20~50g / L (NH 4 ) 2 SO 4 , soaking time 5min.

[0027] 6) Rinse with deionized water.

[0028] 7) For chrome plating, the composition of the plating solution is: H 2 SO 4 1~2g / L, CrO 3 150~200g / L, CeF 4 5~15g / L,SmF 3 2~8g / L...

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Abstract

The invention discloses a process method for improving the binding force of a chromium coating. The process method sequentially comprises the following steps of high-energy shot blasting, substrate polishing, oil removal, water washing, weak acid activation, water washing, chromium plating, heat treatment and coating polishing. The process method has the advantages of no cracks, no pores, compactness and smoothness and the like, combination between a plating layer and a base body is good, quality of a chromium plating product is greatly improved, and the long service life of the product is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of electroplating processing, and relates to a chromium plating process method for enhancing the binding force of a chromium layer on the surface of a metal material. [0002] technical background [0003] Chromium is a silver-white metal with a beautiful light blue color. Metal chromium is easily passivated in the air, and a very thin inert oxide film is formed on the surface. It is a metal material with good anti-corrosion performance, and The chromium plating layer has high hardness and good high temperature resistance, and is widely used in industry. [0004] However, in some metal materials resistant to medium and high temperature, a certain amount of Cr element is generally contained. The higher content of Cr element is easy to oxidize, and can quickly form various complex oxide films on the surface of the steel, and affect the coating and coating during the plating process. When the bonding force of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/08C25D5/36C25D5/50C25D5/52
CPCC25D3/08C25D5/36C25D5/50C25D5/52
Inventor 史永红刘京雷徐宏许岩峰
Owner SINOPEC YANGZI PETROCHEM