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High corrosion resistant surface treated magnesium alloy product and its Manufacturing process

A high corrosion resistance, surface treatment technology, applied in the direction of metal material coating process, etc., can solve the problem that the degree of corrosion resistance may not meet the requirements, and achieve the effect of improved corrosion resistance, long life and good corrosion resistance

Inactive Publication Date: 2006-01-25
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the magnesium alloy is chemically treated with a chemical treatment bath containing permanganic acid or a water-soluble salt of manganic acid, a corrosion-resistant surface-treated magnesium alloy with high recyclability can be obtained. However, the degree of corrosion resistance is not necessarily the same. Can meet the requirements, so further improvement is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9

[0035] Multiple test pieces made of magnesium alloy (AZ 91) were ultrasonically washed in acetone at room temperature for 15 minutes, and dried at room temperature for 5 minutes. Then, after immersing in potassium pyrophosphate aqueous solution (35g / L, 60 degreeC) for 1 minute, it wash|cleaned with the tap water of room temperature for 30 seconds, and the pure water of room temperature for 30 seconds. Next, after immersing in caustic soda aqueous solution (50g / L, 60 degreeC) for 3 minutes, it washed with tap water at room temperature for 30 seconds and with pure water at room temperature for 30 seconds.

[0036] Immerse each test piece through the above-mentioned treatment in the chemical treatment solution successively, and the treatment solution contains KMnO at the concentration shown in Table 1 respectively. 4 、Na 3 PO 4 、CH 3 COOH and CH 3 COONa, and have the pH value shown in Table 1 and the treatment temperature, and the dipping treatment time is also shown in Table...

Embodiment 10

[0050] Multiple test pieces made of magnesium alloy (AZ 91) were ultrasonically washed in acetone at room temperature for 15 minutes, and dried at room temperature for 5 minutes. Then, after immersing in potassium pyrophosphate aqueous solution (35g / L, 60 degreeC) for 1 minute, it wash|cleaned with the tap water of room temperature for 30 seconds, and the pure water of room temperature for 30 seconds. Next, after immersing in caustic soda aqueous solution (50g / L, 60 degreeC) for 3 minutes, it washed with tap water at room temperature for 30 seconds and with pure water at room temperature for 30 seconds.

[0051] Each of the above-treated test pieces was sequentially immersed in the chemical treatment solution used in Example 1 for 1 minute, and then washed with tap water at room temperature for 30 seconds and with pure water at room temperature for 30 seconds. Finally, dry at room temperature for 2 hours. The total area of ​​the chemical treatment test piece reaches 0, 25, 50...

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Abstract

Disclosed is a method for processing high corrosion resistance surface treated magnesium alloy product, the surface of an aluminum-containing magnesium alloy is subjected to chemical treatment for 0.3 to 10 min with a treating solution in which the concentration of the water soluble salt of permanganic acid or manganic acid is >= 2 g / L expressed in terms of the content of KMnO4 and also less than the solubility thereof, the concentration of the water soluble salt of phosphoric acid is 0.05 to 100 g / L expressed in terms of the content of Na3PO4, the concentration of acetic acid is 0.05 to 100 ml / L, the concentration of sodium acetate is 0.05 to 50 g / L, pH is <= 7, and solution temperature is 288 to 368 K, and the high corrosion resistance surface treated magnesium alloy product is obtained by the producing method. A magnesium alloy product having a high corrosive resistance surface produced according to the present invention has a Mn adhesion of 100 to 600 mg / m2, P adhesion of < 200 mg / m2, CH3COO-adhesion of 0.01 to 1000 mg / m2.

Description

technical field [0001] The present invention relates to a surface-treated magnesium alloy product with high corrosion resistance obtained by chemically treating the surface of an aluminum-containing magnesium alloy and a manufacturing method thereof. , manufactured by chemical treatment, but has the same or higher corrosion resistance as chromate-treated products that have been chemically treated with a treatment solution containing hexavalent chromium, and has a highly recyclable surface treatment with high corrosion resistance Magnesium alloys and methods for their manufacture. Background technique [0002] As a chemical treatment bath for magnesium alloys, especially for aluminum-containing magnesium alloys, three types of JIS II 8661 standards are known, as well as chromate baths described in Japanese Patent Laid-Open Publication No. 8-225954, and JIS H 11 types of the 8651 standard, and JP-A-8-35073, Jan Ivar Skar, et al., SAE Technical Paper Series, 970324, pp-7-11, 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/07C23C22/18C23C22/68
Inventor 松嶋英明百武正浩笠原畅顺铃木光夫土桥诚
Owner MITSUI MINING & SMELTING CO LTD
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