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Treatment method on surface of magnesium alloy

A surface treatment liquid, magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of environmental pollution, limited use range, etc., to achieve the effect of good corrosion resistance, avoid instability and easy operation

Active Publication Date: 2009-09-23
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

However, chromium treatment will cause serious environmental pollution due to the existence of hexavalent chromium, and its applicati

Method used

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  • Treatment method on surface of magnesium alloy

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Embodiment 1

[0031] The specific process and steps in this embodiment are as follows:

[0032] 1. At room temperature, place the polished and washed magnesium alloy workpiece in an acetone solution for 45 seconds for ultrasonic disinfection;

[0033] 2. Put the above-mentioned clean magnesium alloy workpiece into the alkali washing solution, and carry out alkali washing under magnetic stirring; the alkali washing temperature is 65 ° C, and the time is 15 minutes;

[0034] The formula of described alkaline lotion is as follows:

[0035] Add a certain amount of various sodium salts to 1 liter of pure water solvent. The concentrations of various sodium salts are: sodium phosphate 55g / L, sodium hydroxide 20g / L, sodium silicate 25g / L and sodium carbonate 2.5g / L L; form the alkaline washing solution of mixed sodium salt;

[0036] 3. Subsequently, the above alkali-washed magnesium alloy workpiece is treated with a fluorozirconate composite conversion coating surface treatment solution; the form...

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Abstract

The invention relates to a treatment method on surface of magnesium alloy, belonging to the technical field of chemical treatment technology of metal surface. The invention provides a method of surface treatment of magnesium alloy. The method comprises the main procedures as follows: the surface of magnesium alloy is polished, washed by alkali, then processed by fluorozirconate composite conversation film surface treatment fluid, and finally sprayed with thermoplastic acrylic acid inhalator paint to finish the surface treatment; The formation of chemical conversion film is the most important key process, fluorozirconate composite conversation film surface treatment fluid mainly contains aqueous solution formed by fluorozirconate, dihydric phosphate, phosphoric acid, ammonium bifluoride and film formation accelerators namely nitrobenzene sodium dulfonate, inhibitor sodium fluoride or sodium borate and the like, the chemical conversion film generated by treatment has better corrosion resistance, and has excellent adhesive force with subsequent organic coating, thus being capable of enhancing the anticorrosion ability of magnesium alloy. Furthermore, the treatment fluid contains no chromium compounds, thereby preventing hexavalent chromium ion from polluting the environment, thus being beneficial for environmental protection.

Description

technical field [0001] The invention relates to a treatment method for the surface of a magnesium alloy, which belongs to the technical field of metal surface chemical treatment. Background technique [0002] Magnesium alloy has many excellent physical and mechanical properties, has high specific strength and specific stiffness, is easy to cut and process, and can withstand large shock and vibration loads. It has excellent shock absorption, electrical and thermal conductivity, and magnetic shielding properties. Small, it is an ideal modern structural material, which can be widely used in the fields of automobiles, machinery manufacturing, aerospace, electronics, communications, military, optical instruments and computer manufacturing. [0003] However, as a structural material, the fatal flaw of magnesium alloy is poor corrosion resistance, and the standard electrode potential is only -2.36V, which makes magnesium alloy prone to serious corrosion in humid atmosphere, soil an...

Claims

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Application Information

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IPC IPC(8): C23C22/36C23C22/76C23G1/16
Inventor 成旦红叶根段剑辉曹铁华彭根生
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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