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Bolt electroplating pretreatment method

A technology of pretreatment and bolts, applied in cleaning methods and utensils, chemical instruments and methods, cleaning methods using liquids, etc., can solve problems such as poor pretreatment effect, and achieve smooth and beautiful workpiece surface, high economic benefits, and easy operation. handy effect

Inactive Publication Date: 2015-12-30
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

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art that the effect of electroplating pretreatment on the surface of bolts is not good, to provide a bolt electroplating pretreatment process, to pretreat the surface of bolt workpieces, and to improve the surface quality and quality of the subsequent electroplating layer. Binding force

Method used

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  • Bolt electroplating pretreatment method
  • Bolt electroplating pretreatment method
  • Bolt electroplating pretreatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take the bolts to be treated and put them into the electrolyte, turn on the electricity and electrolyze, and degrease and degrease the bolt matrix. Then, the degreased bolts are put into dilute hydrochloric acid, and the oxides on the surface of the bolt matrix are removed by pickling. After pickling, put it in ethanol, ultrasonically clean it, and dry it. The ionic liquid of aluminum oxide and disubstituted imidazolium chloride with a molar ratio of 2:1 is used as the activation solution, the bolt workpiece is used as the anode, and the Al plate is used as the cathode. 2 The current density is used for activation, and the activation time is 6 minutes.

[0042] 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, and the stirring rate is 200r / min.

Embodiment 2

[0044] Get the bolts to be treated and put them into the electrolyte solution: sodium hydroxide 40g / L, sodium carbonate 30g / L, trisodium phosphate 10g / L. , heated to 65°C, energized and electrolyzed for 1 minute, with a current density of 4mA / cm 2 , Degreasing and degreasing. Then, put the degreased bolts into dilute nitric acid, soak and pickle for 30 seconds to remove the oxides on the surface. After pickling, put it into propanol, set the ultrasonic instrument to 100W, ultrasonically clean for 15min, and dry. The ionic liquid of aluminum oxide and disubstituted imidazolium chloride with a molar ratio of 3:1 is used as the activation solution, the bolt workpiece is used as the anode, and the Al plate is used as the cathode. 2 The current density is used for activation, and the activation time is 8 minutes.

Embodiment 3

[0046] This embodiment is used to illustrate the bolt electroplating pretreatment method provided by the present invention.

[0047] The experimental material is high-strength bolts, and the specific operation steps are as follows:

[0048] (1) One-step oil removal, the oil removal solution formula is: sodium hydroxide 30g / L, sodium carbonate 30g / L, trisodium phosphate 5g / 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 high-strength 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.

[0049] (2) Pickling, pickling solution formula: 5% dilute hydrochloric acid. Immerse the electrolytically degreased high-strength bolt workpiece in the pi...

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Abstract

The invention discloses a bolt electroplating pretreatment method. A process comprises steps as follows: (1), electrolytic degreasing: a bolt is put in an electrolyte, and electrolytic degreasing is performed; (2), acid pickling of the bolt: oxide on the surface of a bolt base is removed through acid pickling; (3), ultrasonic cleaning: airing / drying is performed; (4), anode activation of an ionic liquid: an activation liquid is a system formed by AlCl3 and organic salt, the organic salt is bis-substituted imidazolium chloride, and the mole ratio of AlCl3 to the organic salt is (0.5-4) :1. The activation mode is implemented as follows: a bolt workpiece is taken as an anode, an Al plate is taken as a cathode, the temperature of the activation liquid is 15-80 DEG C, preferably, 20-60 DEG C, the activation current density is 2-10 mA / cm<2>, and the activation time is 2-8 min. According to the method, the process is simple, the operation is convenient, the energy consumption is low, no pollution is produced to the environment, the bolt can have a clean surface without an oxidation layer, and the electroplating binding force and the corrosion resistance are conveniently improved.

Description

technical field [0001] The invention relates to an electroplating pretreatment method, in particular to a bolt surface pretreatment method and its application, and belongs to the field of material surface treatment. Background technique [0002] Bolts are widely used in the fields of construction, home appliances, automobiles, and petrochemicals. However, under some extremely harsh conditions, such as marine environments, electrochemical reactions are prone to occur on the surface of bolts, resulting in rust and corrosion. Rusted bolts reduce the structural strength, directly affect the stability of the equipment, and even cause certain safety hazards. Therefore, it is very necessary to carry out surface treatment on traditional bolts to improve their anti-corrosion performance. [0003] At present, the most widely used surface treatment method is anti-corrosion plating, which deposits a corrosion-resistant layer on the surface of the bolt through electrochemical reaction ...

Claims

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Application Information

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IPC IPC(8): C25D5/36C25D11/34C25F1/00C23G1/08B08B3/12
Inventor 廖成丁晶晶江奕东黄迎春郑兴平凌国平梅军刘焕明
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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