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Method for electroplating shaft bushing antifriction layer by metilsulfate plating bath

A methanesulfonate and electroplating shaft technology, which is applied to bearing components, shafts and bearings, mechanical equipment, etc., can solve the problems of difficult emission standards, low yield, and environmental hazards, and achieve uniform coating thickness and fine coating crystallization , The effect of simple electroplating process

Inactive Publication Date: 2009-08-12
JIAYING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electroplating process of the existing Pb-Sn-Cu ternary alloy anti-friction coating all adopts the fluoroborate plating solution system, and the plating solution has some defects, such as the plating solution is unstable, and it is necessary to use a nickel-plated grid to prevent tin in the alloy coating. Diffusion of atoms to the substrate, low yield, not suitable for mass continuous production; and due to the strong complexation of fluoroboric acid, Pb-containing 2+ , F - It is very difficult to treat toxic waste water, the cost of waste water treatment is high, and it is difficult to achieve standard discharge, which is harmful to the environment. In recent years, many countries and regions have banned the use of fluoroborate plating bath electroplating process

Method used

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  • Method for electroplating shaft bushing antifriction layer by metilsulfate plating bath
  • Method for electroplating shaft bushing antifriction layer by metilsulfate plating bath
  • Method for electroplating shaft bushing antifriction layer by metilsulfate plating bath

Examples

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Effect test

Embodiment 1

[0012] Double-sided electroplating of lead-tin-copper alloy plating on a platinum sheet with a specification of 3×4cm after degreasing and weighing. Activate with dilute hydrochloric acid prepared from 1 volume of concentrated hydrochloric acid to 3 volumes of water for 1 to 2 minutes, wash the activated platinum sheet with water, and then use the above-mentioned methanesulfonate plating solution at room temperature. The anode is a lead-tin alloy containing 10% tin. , cathode current density 2.5A / dm 2 , double-sided electroplating for 20 minutes on the platinum sheet to obtain a uniform, smooth and dense lead-tin-copper coating on the surface. The thickness of the prepared lead-tin-copper coating on the platinum sheet was measured to be 22 μm, and the content of the lead-tin-copper coating was dissolved by acid and analyzed by volume: 7.8% tin, 2.3% copper, and 89.9% lead.

Embodiment 2

[0014] Electroplate lead-tin-copper plating on the inner surface of 15 copper-lead alloy bearing bushes with specifications of 490QZL at the same time. The bearing bush first uses NaOH containing 12g / L, containing Na 2 CO 3 25g / L, containing Na 3 PO 4 12H 2 O is 60g / L, containing Na 2 SiO 3 It is a 12g / L degreasing liquid, and ultrasonic degreasing is carried out at a temperature of 50°C for 5 minutes; after the ultrasonic degreasing of bearing bushes, the NaOH content of 12g / L and Na 2 CO 3 25g / L, containing Na 3 PO 4 12H 2 O is 35g / L, containing Na 2 SiO 3 It is 7g / L electrolytic degreasing fluid, use steel plate as anode at room temperature, and the cathode current density is 2.5A / dm 2 Conduct electrolytic degreasing for 4 minutes; after the second degreasing and cleaning of the bearing bush, activate it with dilute hydrochloric acid with a volume ratio of 1:3, that is, dilute hydrochloric acid composed of 1 volume of concentrated hydrochloric acid and 3 volumes...

Embodiment 3

[0017] Electroplate lead-tin-copper coatings on the inner surfaces of 45 copper-lead alloy bearing bushes whose specifications are 490QZL at the same time. The bearing bush first uses NaOH containing 12g / L, containing Na 2 CO 3 25g / L, containing Na 3 PO 4 12H 2 O is 60g / L, containing Na 2 SiO 3 It is a 12g / L degreasing liquid, and ultrasonic degreasing is carried out at a temperature of 60°C for 5 minutes; after the bearing bush is ultrasonically degreased, the NaOH containing 12g / L and NaOH are used for hanging. 2 CO 3 25g / L, containing Na 3 PO 4 12H 2 O is 35g / L, containing Na 2 SiO 3 It is 7g / L electrolytic degreasing fluid, use steel plate as anode at room temperature, and the cathode current density is 2.5A / dm 2 Carry out cathodic electrolytic degreasing for 5 minutes; after the second degreasing and cleaning of the bearing bush, activate it with dilute hydrochloric acid with a volume ratio of 1:3 for 2 minutes; put the activated bearing bush into 60 liters of...

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Abstract

The invention relates to a method for plating a bush antifriction coating through a methyl sulfonate bath. The method comprises the following steps: (1) cleaning a bush after ultrasonic degreasing, and cleaning a bush upper ring after cathode electroplating degreasing; (2) cleaning the bush after dilute hydrochloric acid activation for 1 to 2 minutes, placing the bush into the methyl sulfonate bath, taking a terne metal containing 10 percent of tin as an anode at a room temperature, carrying out the electroplating for 18 to 22 minutes when the cathode current density is 2 to 3 A / dm, and then cleaning the bush and obtaining a terne copper coating on the inner surface of the bush; and (3) placing the bush into a tinning bath, taking a steel plate as an anode at 75 to 80 DEG C, carrying out the electroplating for 3 to 8 minutes when the cathode current density is 1 to 1.5 A / dm, and obtaining a tin coating on the inner surface of the bush. The methyl sulfonate bath has stable performance and a simple process; the coating has fine crystallization, good hardness and good abrasion resistance; the bush coating has even thickness; as no strong complexing agent and F are contained, wastewater is easily processed; and the method is suitable for plating the bush antifriction coating on large and medium-size diesel engines and combustion engines.

Description

technical field [0001] The invention relates to a large and medium-sized diesel engine and internal combustion engine bearing bush antifriction coating electroplating process, in particular to a method for electroplating the bearing bush antifriction coating with an environment-friendly methanesulfonate plating solution. Background technique [0002] Pb-Sn-Cu ternary alloy coating is widely used in large and medium-sized diesel engines and internal combustion engine bearing bushes as friction-reducing layers due to its good compactness, corrosion resistance, wear resistance and fatigue resistance. The electroplating process of the existing Pb-Sn-Cu ternary alloy anti-friction coating all adopts the fluoroborate plating solution system, and the plating solution has some defects, such as the plating solution is unstable, and it is necessary to use a nickel-plated grid to prevent tin in the alloy coating. Diffusion of atoms to the substrate, low yield, not suitable for mass pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56F16C33/06F16C33/14
Inventor 曾育才唐春保
Owner JIAYING UNIV
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