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A kind of electroplating pretreatment method for stainless steel bolts

A kind of stainless steel and pretreatment technology, which is applied to the pretreatment of stainless steel bolt surface and the field of electroplating pretreatment of stainless steel materials, can solve the problem that the special-shaped structure is difficult to fully remove the surface oxide layer, etc., to achieve smooth and beautiful surface of the workpiece, good bonding force, Easy-to-use effects

Active Publication Date: 2018-10-09
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that the electroplating pretreatment method in the prior art is difficult to fully remove the surface oxide layer for the special-shaped structure of stainless steel bolts, and to provide a surface pretreatment method specially for stainless steel bolts

Method used

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  • A kind of electroplating pretreatment method for stainless steel bolts
  • A kind of electroplating pretreatment method for stainless steel bolts
  • A kind of electroplating pretreatment method for stainless steel bolts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take the 304 stainless steel bolts to be treated, and use the one-step electrolytic degreasing method to degrease and degrease the bolt matrix. Then, put the degreased stainless steel bolts into 5% dilute hydrochloric acid, and use conventional pickling methods to remove the surface of the bolt matrix and oxides. After pickling, put it in ethanol, ultrasonically clean it, and dry it. The Lewis basic ionic solution prepared by aluminum oxide and disubstituted imidazolium chloride (EMIC) with a molar ratio of 1:2 was used as the activation solution, the stainless steel bolt workpiece was used as the anode, and the aluminum plate was used as the cathode. 8mA / cm 2 The current density is activated, and the activation time is 5min.

[0040] Further, during the activation process, the activation solution is stirred to promote the disturbance of the ionic liquid on the surface of the workpiece, so that the oxide layer is completely removed during the anodic activation process...

Embodiment 2

[0042] Take the 304 stainless steel bolts to be treated, and degrease and degrease the bolt matrix by one-step electrolytic degreasing method. The electrolyte composition is: sodium hydroxide 40g / L, sodium carbonate 30g / L, and trisodium phosphate 15g / L. Then, put the degreased stainless steel bolts in 3% dilute nitric acid, soak and pickle for 30 seconds, pay attention to turning over during the soaking process, and remove the surface of the bolt matrix and oxides. After pickling, put it in propanol, ultrasonically clean it for 10 minutes, and dry it. The Lewis basic ionic solution prepared by aluminum oxide and disubstituted imidazole chloride with a molar ratio of 1:3 is used as the activation solution, the stainless steel bolt workpiece is used as the anode, and the aluminum plate is used as the cathode. 2 The current density is activated, and the activation time is 3 minutes. During the activation process, the activation solution is stirred at a stirring rate of 50r / min to...

Embodiment 3

[0044] This embodiment is used to illustrate the bolt electroplating pretreatment method provided by the present invention.

[0045] The experimental material is 304 stainless steel bolts, and the specific operation steps are as follows:

[0046] (1) One step degreasing

[0047] The degreasing liquid formula is: sodium hydroxide 30g / L, sodium carbonate 30g / L, trisodium phosphate 5 g / L and the balance deionized water. Except for ionized water, other components are dissolved in deionized water according to the proportion of the formula, and mixed to obtain an aqueous solution, which is put into a tank for use. Put the 304 stainless steel bolt workpiece as the cathode, and the 304 stainless steel plate as the anode, put it into the electrolyte at a temperature of 60°C, and apply a current density of 5mA / cm 2 , electrolytic degreasing 1min.

[0048] (2) pickling

[0049] Pickling solution formula: 5% dilute hydrochloric acid. Immerse the electrolytically degreased 304 stainle...

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Abstract

The invention discloses a pretreatment method for electroplating of a stainless steel bolt. The pretreatment method comprises the following steps (1), a bolt base is degreased with a one-step electrolytic degreasing method; (2) pickling is performed: oxides on the surface of the bolt base are removed with a conventional pickling method; (3), ultrasonic cleaning is performed in low-mass-molecule alcohol; (4), anode activation is performed in an ionic liquid with Lewis base property, wherein the ionic liquid is prepared from AlCl3 and organic salt in the molar ratio of AlCl3 to the organic salt being (0-0.8):1, the anode activation parameters are as follows: a stainless steel bolt workpiece is taken as an anode, an aluminum plate is taken as a cathode, the temperature of an activator is 15-80 DEG C, the activation current density is 2-10 mA / cm<2>, and the activation time is 2-8 min. The method is simple in process and convenient to operate, has little energy consumption and no environmental pollution, can effectively remove a passive film on the surface of the stainless steel bolt and has broad application prospects, a clean surface without an oxidation layer is obtained, and a functional plating with excellent binding force can be obtained.

Description

technical field [0001] The invention relates to an electroplating pretreatment method for stainless steel materials, in particular to a pretreatment method applied to the surface of stainless steel bolts, and belongs to the technical field of electroplating. Background technique [0002] Bolts are widely used in the fields of construction, home appliances, automobiles, and petrochemicals, especially stainless steel bolts are more widely used because they have certain anti-corrosion capabilities. However, in the marine environment, or under some extremely harsh conditions, even stainless steel bolts will rust and corrode, which will affect production and preparation, and even cause a series of potential safety hazards. Therefore, even stainless steel bolts sometimes require surface treatment to improve their surface corrosion resistance through surface modification. [0003] The most widely used surface treatment at present is to coat the bolt surface with an anti-corrosion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/36C25D11/34
Inventor 廖成丁晶晶江奕东黄迎春郑兴平梅军刘焕明
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS