Preparation method of cathode protection coating on aluminum alloy surface

A cathodic protection and aluminum alloy technology, which is applied in the coating, epoxy resin coating, etc., can solve the problems of complex methods and numerous procedures, and achieve the effect of simple process, good repeatability and good corrosion resistance

Inactive Publication Date: 2014-09-03
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But above-mentioned method that magnesium powder i...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1 adopts the following steps to realize the present invention:

[0028] (1) Clean and decontaminate the surface of the aluminum alloy, ultrasonically clean it with distilled water for 15 minutes, and then dry it in a drying oven; the raw material is an alloy formed by mixing and smelting pure metal aluminum and pure metal magnesium, and the mass percentage of aluminum is 60%, the mass percentage of magnesium is 40%, and the fine metal powder with a particle size of 30 μm is made by pulverizing technology;

[0029] (2) Solvent, white carbon black, alkane coupling agent, silicone oil defoamer, and epoxy resin mixed with aluminum-magnesium metal powder, polyamide, xylene and n-butanol at a ratio of 7:3 at a dosage ratio of 0.65:0.2 : 2.0: 0.006: 0.02: 0.15: 1 mixed, put into a ball mill, and fully grind for 1 hour at a stirring speed of 25Hz, so that each component in it is evenly distributed, and prepared into a coating;

[0030] (3) The coating prepared in st...

Embodiment 2

[0032] Embodiment 2 adopts the following steps to realize the present invention:

[0033] (1) Clean and decontaminate the surface of the aluminum alloy, ultrasonically clean it with distilled water for 10 minutes, and then dry it in a drying oven; the raw material is an alloy formed by mixing and smelting pure metal aluminum and pure metal magnesium, and the mass percentage of aluminum is 50%, the mass percentage of magnesium is 50%, and the fine metal powder with a particle size of 10 μm is made by pulverizing technology;

[0034](2) Solvent, organic bentonite, titanate coupling agent, mineral oil, and epoxy resin mixed with aluminum-magnesium metal powder, polyamide, xylene and n-butanol at a ratio of 7:3: 0.75:0.4: Mix 1.0:0.01:0.03:0.1:1, put it into a ball mill, and grind it at a stirring speed of 35Hz for 3 hours to make the components evenly distributed and prepare a coating;

[0035] (3) Apply the paint prepared in step (2) evenly on the aluminum alloy substrate by br...

Embodiment 3

[0037] Embodiment 3 Adopt the following steps to realize the present invention:

[0038] (1) Clean and decontaminate the aluminum alloy surface, ultrasonically clean it with distilled water for 20 minutes, and then dry it in a drying oven; the raw material is an alloy formed by mixing and smelting pure metal aluminum and pure metal magnesium, and the mass percentage of aluminum is 40%, the mass percentage of magnesium is 60%, and the fine metal powder with a particle size of 25 μm is made by pulverizing technology;

[0039] (2) The solvent, white carbon black, titanate coupling agent, silicone oil defoamer, and epoxy resin mixed with aluminum-magnesium metal powder, polyamide, xylene and n-butanol at a ratio of 6:4 are used at a ratio of 0.8 : 0.5: 1.5: 0.008: 0.04: 0.1: 1, put it into a ball mill, and grind it at a stirring speed of 25Hz for 4 hours to make the components evenly distributed and prepare a coating;

[0040] (3) The coating prepared in step (2) was evenly coate...

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Abstract

The invention discloses a preparation method of an aluminum-magnesium-rich alloy coating for protecting an aluminum alloy cathode. The method disclosed by the invention comprises the following steps of mixing epoxy resin, aluminum-magnesium metal micropowder, a curing agent, a solvent, an auxiliary, a coupling agent and a defoaming agent according to a certain ratio; placing the mixture into a ball mill for sufficiently grinding to ensure that all components in the mixture are uniformly distributed so as to prepare a corrosion-resistant coating; then, covering the coating on the aluminum alloy surface washed in advance and subjected to ultrasonic treatment by using a spray coating or brush coating or roller coating method; finally, curing at room temperature, and drying for 5-7d to form a cathode protective coating with high corrosion resistance on the aluminum alloy surface. The coating prepared by using the method disclosed by the invention has favorable corrosion resistance 10 times of that of a magnesium-rich coating under salt-spray and seawater environments and still can protect an aluminum alloy matrix even if the coating on the aluminum alloy surface is damaged; the method is relatively simple, good in repeatability and suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing a corrosion-resistant coating, in particular to a method for preparing a corrosion-resistant coating for cathodic protection on the surface of an aluminum alloy, and belongs to the technical field of anti-corrosion coating materials. Background technique [0002] Aluminum and aluminum alloys are widely used in the chemical industry, aerospace industry, automobile manufacturing industry, food industry, electronics, and instrumentation industries due to their advantages such as high strength, low density, strong electrical and thermal conductivity, excellent mechanical properties, and good processability. and the shipbuilding industry. Under natural conditions, a natural oxide film with a thickness of about 4nm is easy to form on the surface of aluminum alloy, but this film is porous, uneven and has poor corrosion resistance, making it difficult to resist corrosion in harsh environments. [0003] Aiming at...

Claims

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Application Information

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IPC IPC(8): C23F13/06C09D163/00
Inventor 赵娟杨耐德周亮
Owner GUANGDONG OCEAN UNIVERSITY
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