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Preparation method of magnesium alloy rare-earth conversion coatings for ethylene glycol cooling system

A cooling system and rare earth conversion technology, applied in the coating process of metal materials, etc., can solve problems such as magnesium alloy corrosion, and achieve the effect of solving severe corrosion, simple composition, and excellent corrosion resistance

Active Publication Date: 2011-08-31
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing an environment-friendly rare earth conversion coating on the surface of a magnesium alloy. The prepared conversion coating layer is uniform and dense, and has excellent corrosion resistance in the glycol-water cooling system, which can solve the problem of engine cooling. Severe Corrosion of Magnesium Alloys Used in the System in Coolant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The processed sample is a die-cast AZ91D magnesium alloy with a sheet-like plane workpiece with a size of 100mm×100mm×2mm. The specific operation steps are as follows:

[0019] 1. Sample pretreatment and activation: mechanically polish the sample surface to its roughness R a ≈0.18μm, use ordinary detergent to clean the surface of the polished sample to remove oil stains, rinse with distilled water, and then place it in an acetic acid solution with a concentration of 3 to 5% for activation for 1 to 2 minutes.

[0020] 2. Preparation of chemical conversion coating: Place the activated magnesium alloy in a composite solution of 25g / L ammonium borate and 12g / L cerium sulfate. The temperature is controlled to 80℃, the treatment time is 20 minutes, and then the concentration is added. After immersing in 3.5wt% ammonium fluoride solution for 20 minutes, after taking out a layer of black reaction residue on the rinsed surface, a uniform, compact, white and bright rare earth conversio...

Embodiment 2

[0023] The processed sample is a die-cast AZ91D magnesium alloy with a sheet-like plane workpiece with a size of 100mm×100mm×2mm. The specific operation steps are as follows:

[0024] 1. Sample pretreatment and activation: mechanically polish the sample surface to its roughness R a ≈0.18μm, use ordinary detergent to clean the surface of the polished sample to remove oil stains, rinse with distilled water, and then place it in an acetic acid solution with a concentration of 3 to 5% for activation for 1 to 2 minutes.

[0025] 2. Preparation of chemical conversion coating: place the activated magnesium alloy in a composite solution of 15g / L ammonium borate and 15g / L cerium sulfate. The temperature is controlled to 100℃, the treatment time is 30 minutes, and then the concentration After immersing in a 4wt% ammonium fluoride solution for 15 minutes, after taking out a layer of black reaction residue on the rinsed surface, a uniform, compact, white and bright rare earth conversion film ca...

Embodiment 3

[0028] The processed sample is a die-cast AZ91D magnesium alloy, a tubular workpiece with a length of 400mm and a diameter of 2mm (inner tube wall treatment). The specific operation steps are as follows:

[0029] 1. Sample pretreatment and activation: mechanically polish the sample surface to its roughness R a ≈0.18μm, use ordinary detergent to clean the surface of the polished sample to remove oil stains, rinse with distilled water, and then place it in an acetic acid solution with a concentration of 3 to 5% for activation for 1 to 2 minutes.

[0030] 2. Preparation of chemical conversion coating: Place the activated magnesium alloy in a composite solution of 20g / L ammonium borate and 10g / L cerium sulfate. The temperature is controlled to 80℃, the treatment time is 15 minutes, and then the concentration After immersing in a 4wt% ammonium fluoride solution for 20 minutes, after removing a layer of black reaction residue on the rinsed surface, a uniform, compact, and bright-colored r...

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Abstract

The invention discloses a preparation method of magnesium alloy rare-earth conversion coatings for an ethylene glycol cooling system, which includes a process of pretreatment and activating and chemical conversion coating. The prepared rare-earth conversion coating has even thickness and good surface consistence, has good corrosion-resistant performance in ethylene glycol-water cooling liquid, and can solve the problem of the severe corrosion of engine cooling system used magnesium alloy in cooling liquid.

Description

Technical field [0001] The invention belongs to a magnesium alloy surface treatment technology, and specifically relates to a preparation method of a rare earth conversion film on a magnesium alloy surface for a glycol type cooling system. Background technique [0002] Automobile lightweight is one of the most effective measures to reduce fuel consumption and emissions. Magnesium alloys are recognized as the most promising automobile lightweight materials today. The use of magnesium alloys in automobile cooling systems has good potential for weight reduction and application prospects, but it must face the problem of corrosion of magnesium alloys by the coolant. Coolant is an indispensable heat transfer medium in the engine cooling system. At present, commercial coolants are basically glycol-water systems. Several materials commonly used in engine systems, such as steel, aluminum alloy, and copper, can basically meet the corresponding life standards in common commercial coolants....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/05C23C22/34
Inventor 王立平薛群基周添红雷自强
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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