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Nano zinc-cobalt alloy coating based on double-pulse electrodeposition and preparation method of nano zinc-cobalt alloy coating

An electrodeposition and double-pulse technology, applied in the field of electroplating alloys, can solve problems such as research on the influence of non-zinc-cobalt alloy coatings, and achieve the effects of bright surface, reduced concentration polarization, and uniform crystallization

Active Publication Date: 2020-02-07
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on the double-pulse electrodeposition of zinc-cobalt alloys, and no specific research has been done on the influence of double-pulse parameters on zinc-cobalt alloy coatings

Method used

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  • Nano zinc-cobalt alloy coating based on double-pulse electrodeposition and preparation method of nano zinc-cobalt alloy coating
  • Nano zinc-cobalt alloy coating based on double-pulse electrodeposition and preparation method of nano zinc-cobalt alloy coating
  • Nano zinc-cobalt alloy coating based on double-pulse electrodeposition and preparation method of nano zinc-cobalt alloy coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) The zinc plate with a purity greater than 99.99% is used as an anode plate after the following treatment: first polish it with sandpaper to remove the surface oxide layer, stains, etc., then wash it with distilled water, then degrease, rinse it with distilled water, Dry with a hair dryer before use.

[0032] 2) The low-carbon steel sheet is used as the cathode plate after the following treatment. The low-carbon steel sheet is ground and polished with sandpaper in turn, then cleaned by chemical degreasing, and then subjected to weak erosion. The function of weak erosion is to remove the surface of the cathode plate Oxide film, so that the base material of the cathode plate is completely exposed, so that the base material of the cathode plate and the electroplating layer can be better combined to achieve a better electroplating effect. The process conditions for chemical degreasing and weak erosion are as follows:

[0033] 1. Chemical degreasing

[0034] bas...

Embodiment 2

[0052] The difference between this example and Example 1 is that the electrodeposition temperature of the plating solution is 30°C, the pH value of the plating solution is 5.0, and the process parameters of the double pulse electrodeposition are: the forward current density is 1.5A / dm 2 , the forward duty cycle is 30%, the forward period is 30ms, and the reverse current density is 0.2A / dm 2 , the reverse duty cycle is 30%.

[0053] The nano-zinc-cobalt alloy coating is subjected to visual inspection, X-ray test, static immersion test, salt spray test and electrochemical test. The average grain size of the nano-zinc-cobalt alloy coating sample is 37.6nm, and the self-corrosion potential is -1.106 V, the self-corrosion current density is 0.79×10 -6 A·cm -2 , The surface of the coating is bright and flat, the crystal is uniform, dense alloy coating, the grain size of the coating is small, the coating has good bonding force with the substrate, and has excellent corrosion resista...

Embodiment 3

[0055] The difference between this embodiment and Example 1 is that the pH value of the plating solution is 4.5, the concentration of boric acid contained in the plating solution is 45g / L, the concentration of sodium sulfate is 25g / L, and the concentration of sodium citrate is 50g / L. L, double pulse electrodeposition process parameters: forward current density 3.0A / dm 2 , the forward duty cycle is 30%, the forward period is 70ms, and the reverse current density is 0.4A / dm 2 , the reverse duty cycle is 70%.

[0056] The nano-zinc-cobalt alloy coating is subjected to visual inspection, X-ray test, static immersion test, salt spray test and electrochemical test. The average grain size of the nano-zinc-cobalt alloy coating sample is 43.1nm, and the self-corrosion potential is -1.114 V, the self-corrosion current density is 0.67×10 -6 A·cm -2 , The surface of the coating is bright and flat, the crystal is uniform, dense alloy coating, the grain size of the coating is small, the ...

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Abstract

The invention discloses a nano zinc-cobalt alloy coating based on double-pulse electrodeposition and a preparation method of the nano zinc-cobalt alloy coating. According to the preparation method ofthe nano zinc-cobalt alloy coating based on double-pulse electrodeposition, a zinc plate is used as an anode, a low-carbon steel sheet is used as a cathode, and a nano zinc-cobalt alloy coating is electroplated in a plating solution through a double-pulse electrodeposition process, wherein the pH value of the plating solution is 4-5. the concentration of zinc ions is 0.64 mol / L-0.70 mol / L, the concentration of cobalt ions is 0.1 mol / L-0.16 mol / L, the electrodeposition time is 20 min, the forward current density is 1.5 A / dm<2>-3.0 A / dm<2>, the forward duty ratio is 30%-70%, the forward period is 30 ms-70 ms, the reverse current density is 0.2 A / dm<2>-0.4 A / dm<2>, the reverse duty ratio is 30%-70%, the forward working time is 100 ms, the reverse working time is 12 ms, and the reverse periodis 1 ms. The surface of the nano zinc-cobalt alloy coating prepared with the preparation method of the nano zinc-cobalt alloy coating based on double-pulse electrodeposition is bright and smooth, crystals are uniform and dense, the binding force of the nano zinc-cobalt alloy coating and a base material is good, and excellent anti-corrosion performance is achieved.

Description

technical field [0001] The invention relates to the technical field of electroplating alloys, in particular to a nano-zinc-cobalt alloy coating based on double-pulse electrodeposition and a preparation method thereof. Background technique [0002] Metal corrosion is a spontaneous and ubiquitous phenomenon in nature. Corrosion of metal materials widely exists in various fields, and the losses caused are very large, especially in the hot and humid marine environment, steel is vulnerable to corrosion by salt spray, tides, etc., and severe electrochemical corrosion occurs, which will not only cause huge economic losses , more likely to cause safety accidents. Due to the vigorous development of modern science and industry technologies such as aviation, energy, and navigation, the stringent requirements for the use of materials in special environments have been continuously improved. Zinc coating is widely used in the protection of steel substrates due to its simple production p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/18
CPCC25D3/565C25D5/18
Inventor 葛文曾子明刘粲李文升牛香全
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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