AZ31B镁合金水热氧化仿金着色试验研究

Coloring AZ31B magnesium alloy with a gold-imitative film by the hydrothermal method

通过水热反应法在KMnO_4溶液中对AZ31B镁合金进行化学氧化成膜处理,考察反应液浓度、反应温度、反应时间对氧化膜形态的影响。结果表明,在较低的温度和较短的时间里制得的氧化膜不完整。在较高的温度下,氧化膜颜色加深、基底变得不平整。较优的反应条件为:高锰酸钾溶液浓度20 g/L、反应温度100℃、反应时间110 min,在此条件下所得氧化膜具有漂亮的仿金色,对镁合金起到良好的装饰作用,并提高其耐腐蚀性能。

AZ31B magnesium alloy has been chemically oxidized by the hydrothermal method in KMnO4 solution to form a film. The film morphology has been investigated with dif- ferent KMnO4 concentration, reaction time and temperature. The results show the incomplete film is obtained with lower temperature and shorter time. The film color deepens at higher temperature and the surface of magnesium alloy becomes uneven because of the quick oxidization reaction. A decorative gold-imitative film can be formed under optimal condition： 20 g/ L KMnO4,100℃ reaction temperature and 110 minutes of reaction time. The gold-imitative film can also protect the magnesium alloy from corrosion.