A kind of preparation method of lead alloy surface anti-corrosion composite coating

A composite coating and lead alloy technology, applied in anodizing and other directions, can solve the problems of weak corrosion resistance of lead alloy components, weak bonding strength of lead alloy matrix, and non-dense oxide film, achieving excellent corrosion resistance and saving time. Uniform effect with production cost, composite coating

Active Publication Date: 2022-07-08
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of electrochemically preparing corrosion-resistant coatings on the surface of lead alloys produces a thin passivation film, resulting in weak bonding with the lead alloy substrate and a non-dense oxide film, resulting in weak corrosion resistance of lead alloy components.
Secondly, the rare earth element cerium (Ce) can refine the crystal grains and enhance the stability of the resulting composite film, but most of the rare earth elements are mixed into the lead alloy by heat treatment process, which is complicated and time-consuming

Method used

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  • A kind of preparation method of lead alloy surface anti-corrosion composite coating
  • A kind of preparation method of lead alloy surface anti-corrosion composite coating
  • A kind of preparation method of lead alloy surface anti-corrosion composite coating

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Experimental program
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Effect test

Embodiment 1

[0034] The sample is lead alloy, and its specific operation steps are as follows:

[0035] (1) Acetone degreasing: Place the polished lead alloy substrate in an acetone solution to remove oil at room temperature for 3 minutes.

[0036] (2) Acidification: Place the polished sample in a 5 ml / L sulfuric acid solution at room temperature for 3 min to remove the oxide and rust layer on the surface of the sample.

[0037] (3) Electrodeposition composite coating: the acid-washed lead alloy is used as the working electrode, the platinum sheet is used as the counter electrode, and the calomel electrode is used as the reference electrode.

[0038] Electrodeposition aqueous solution: 10mmol / L cerium ammonium sulfate ((NH 4 ) 4 Ce(SO 4 ) 4 ), 2g / L polyvinylpyrrolidone (PVP K30 ), 4mol / L sulfuric acid H 2 SO 4 of the mixture.

[0039] Electrolyte temperature: room temperature.

[0040] Electrodeposition parameters: the number of scanning cycles is 200, the potential range is -0.5 ...

Embodiment 2

[0042] The sample is lead alloy, and its specific operation steps are as follows:

[0043] (1) Acetone degreasing; place the polished lead alloy substrate in an acetone solution to remove oil at room temperature for 5 minutes.

[0044] (2) Acidification: Immerse the polished sample in 8 ml / L sulfuric acid solution for 5 min to remove the oxide and rust layer on the surface of the sample.

[0045] (3) Electrodeposition composite coating: the acid-washed lead alloy is used as the working electrode, the platinum sheet is used as the counter electrode, and the calomel electrode is used as the reference electrode.

[0046] Electrodeposition aqueous solution: 10mmol / L cerium ammonium sulfate ((NH 4 ) 4 Ce(SO 4 ) 4 ), 2g / L polyvinylpyrrolidone (PVP K30 ), 5mol / L sulfuric acid H 2 SO 4 of the mixture.

[0047] Electrolyte temperature: 30℃.

[0048] Electrodeposition parameters: the number of scanning cycles is 250, the potential range is -0.9 ~ 1.5V, the deposition time is 20...

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Abstract

The invention discloses a preparation method of an anti-corrosion composite coating on the surface of a lead alloy. The composition of the electrolytic solution for chemical deposition includes 5-30 mmol / L cerium ammonium sulfate, 1-5 g / L polyvinylpyrrolidone, and 1-8 mol / L sulfuric acid; the process conditions for electrochemical deposition are: the temperature is 25-60 ° C, the number of scanning cycles is 50-300, the potential range is ‑0.9-2V, and the deposition time is 10-50min. The main component of the passivation film formed on the surface of the lead alloy by the method of the invention is a composite film layer containing lead sulfate and a small amount of cerium element and organic matter, which is not only flat and dense, but also effectively enhances the corrosion resistance of the lead alloy; the method of the invention has a simple process, and Time-consuming.

Description

technical field [0001] The method of the invention belongs to the technical field of anti-corrosion coating preparation, in particular to a preparation method of a lead alloy surface anti-corrosion composite coating. Background technique [0002] Lead alloys have low melting point, high density, good mechanical strength and casting properties, and are favored by pyrotechnic materials such as cutting cables. However, in the process of storage and long-distance transportation, due to factors such as temperature, humidity and atmospheric composition, lead alloys are easily affected by moisture and cause surface corrosion and white rust. The existence of white rust on the surface of lead alloys seriously affects its performance, especially for some products that require higher mechanical properties and corrosion resistance of lead. The corrosion resistance of lead alloys not only affects production costs, but also affects product quality, so corrosion resistance is a key factor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/34
CPCC25D11/34Y02E60/10
Inventor 陈君江婷婷康凯蔡芳共马素德
Owner XIHUA UNIV
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