镁合金微弧氧化热力学和动力学分析

对镁合金微弧氧化过程中的热力学和动力学进行了计算和分析。结果表明,微弧氧化过程满足热力学条件,微弧氧化不是一个典型的形核长大过程。膜层是在不断击穿、生成、烧结、排泄堆积等过程中生长起来的,而且在反应过程中,膜层的生成是由反应电压、电流、电解液体系、pH值等各种工艺参数所控制的。

Thermodynamic and kinetic analysis of micro-arc oxidation on magnesium alloy

Thermodynamic and kinetic analyses of the micro-arc oxidation(MAO) on magnesium alloy were made . The result indicated that the reactions producing the phases in the coating were thermodynamically possible, and the formation of the MAO film was not a typical nucleation and growth process. A thin oxide film was first formed on the alloy surface by the electrolyte and an MAO coating was finally generated via repeated breakdown, reformation, sintering, ejection and pile-up of the films. The formation of film appeared to be controlled by such process variables as voltage, current, electrolyte system and pH value of the solution.