Formation and Constituent of Surface Oxidized Films in Mg Alloy with Bipolar Pulse Microarc Oxidation

Wang Lishi  Cai Qizhou  Wei Bokang  Liu Quanxin

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Formation and Constituent of Surface Oxidized Films in Mg Alloy with Bipolar Pulse Microarc Oxidation
Issue 3, Pages: 187-190(2005)
Published： 2005 ，
DOI：

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[1]王立世,蔡启舟,魏伯康,刘全心.镁合金双脉冲微弧氧化表面膜层的形成及结构分析[J].特种铸造及有色合金,2005(03):187-190+128.

Wang Lishi Cai Qizhou Wei Bokang Liu Quanxin. Formation and Constituent of Surface Oxidized Films in Mg Alloy with Bipolar Pulse Microarc Oxidation. [J]. Special Casting & Nonferrous Alloys (3):187-190(2005)
[1]王立世,蔡启舟,魏伯康,刘全心.镁合金双脉冲微弧氧化表面膜层的形成及结构分析[J].特种铸造及有色合金,2005(03):187-190+128. DOI：

Wang Lishi Cai Qizhou Wei Bokang Liu Quanxin. Formation and Constituent of Surface Oxidized Films in Mg Alloy with Bipolar Pulse Microarc Oxidation. [J]. Special Casting & Nonferrous Alloys (3):187-190(2005) DOI：

摘要

利用XRD、SEM、EDX等方法

研究了纯镁与AZ91D镁合金在六氟铝酸钠（Na3 AlF6）、氢氧化钾（KOH）、六偏磷酸钠（（NaPO3 ） 6）和三乙醇胺四元组分电解液中双脉冲微弧氧化膜层的形成、膜层形貌和成分结构。研究发现

负脉冲的载入极大地影响了微放电的数量与外观 ;氧化物层表面可以观察到 3类微孔

它们的尺寸范围分别是 0 .5～ 1μm、1～ 2 μm和 4～ 7μm

同时在较大微孔的周围发现有微裂纹存在 ;基体与氧化物交界处存在氟化物富集区

纯镁和AZ91D合金表面膜层的氟化物富集区的尺寸范围分别是 4～ 6μm和 3～ 5 μm。

Abstract

The surface morphology and chemical composition of the formed oxide films on pure magnesium and AZ91D alloy in aqueous electrolytes containing sodium hexafluorinealuminate （Na 3AlF 6）

potassium hydroxide （KOH）

sodium hexametahposphate （NaPO 3） 6

and triethanolamine with bipolar microarc oxidation were investigated by XRD

SEM

EDX.The input of the negative pulse has great effects on the amount and appearance of the microdischarge.Three types of micro-holes

size range in 0.5～1 μm

1～2 μm and 4～7 μm respectively

can be observed on the surface of the oxidized layer

meanwhile micro-cracks appear around a larger micro-hole.There exists a remarkable fluoride-enriched zone with about 4～6 μm for the pure magnesium and 3～5 μm for AZ91D alloy at the coating/substrate interface.