Preparation method of anti-corrosion composite coating on surface of lead alloy

A composite coating and lead alloy technology, applied in the direction of anodic oxidation, etc., 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 Compared with the production cost, the uniform effect of the composite coating

Active Publication Date: 2021-11-30
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method of anti-corrosion composite coating on surface of lead alloy
  • Preparation method of anti-corrosion composite coating on surface of lead alloy
  • Preparation method of anti-corrosion composite coating on surface of lead alloy

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Experimental program
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Effect test

Embodiment 1

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

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

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

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

[0038] Electrodeposition aqueous solution: 10mmol / L ammonium cerium 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 ~ 1.2V, the deposition time is 10m...

Embodiment 2

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

[0043] (1) Acetone degreasing; put the polished lead alloy substrate in acetone solution to degrease, room temperature, time 5min.

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

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

[0046] Electrodeposition aqueous solution: 10mmol / L ammonium cerium 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°C.

[0048] Electrodeposition parameters: the number of scanning cycles is 250, the potential range is -0.9 ~ 1.5V, the deposition time is 20min, take it out, dry it, and get PbS...

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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 method comprises the following steps of degreasing and acidizing a lead alloy matrix, and forming a compact composite coating on the surface of the lead alloy by adopting an electrochemical deposition method, wherein electrolyte for electrochemical deposition comprises 5-30 mmol / L of ammonium cerous sulfate, 1-5 g / L of polyvinylpyrrolidone and 1-8 mol / L of sulfuric acid; and the process conditions of the electrochemical deposition are as follows: the temperature is 25-60 DEG C, the scanning cycle index is 50-300, the potential range is -0.9-2V, and the deposition time is 10-50 minutes. According to the method, a passive film formed on the surface of the lead alloy mainly comprises lead sulfate and is a composite film layer containing a small amount of cerium element and organic matter, the passive film is flat and compact, and the corrosion resistance of the lead alloy is effectively enhanced; and the method is simple in process and short in consumed time.

Description

technical field [0001] The method of the invention belongs to the technical field of anticorrosion coating preparation, and in particular relates to a preparation method of a lead alloy surface anticorrosion composite coating. Background technique [0002] Lead alloy has low melting point, high density, good mechanical strength and castability, and is favored by cutting wire and other explosive materials. However, during storage and long-distance transportation, lead alloys are affected by factors such as temperature, humidity, and atmospheric composition, and are prone to moisture to 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 high lead mechanical properties and corrosion resistance. The corrosion resistance of lead alloys not only affects production costs, but also affects product quality, so corrosion resistance is a key factor in evaluating ...

Claims

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Application Information

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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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