中文摘要：

AZ91D 镁合金在的腐蚀进程中立 1%( 集体部分) 钠氯化物水的答案被电气化学的噪音调查(在) ， SEM 和 EDX。分数维的理论首先被用来描绘合金的腐蚀过程。快小浪变换(FWT ) ，以及快 Fourier 变换(快速傅里叶变换) ，被采用分析 EN 数据。结果证明全面腐蚀过程能被三个阶段描述。第一个阶段对应于坑成核和生长；第二个阶段包含被动氧化物层的生长；并且第三个阶段包含复活。与增加沉浸时间，分数维的尺寸开始快增加，在媒介波动并且最后再增加。Pitting 腐蚀和分数维的尺寸由于坑的开始和形成增加在起始并且沉浸的结束，当时在中等时期由于钝化压抑。SEM 和 EDX 的结果支持上述结论。

英文摘要：

The corrosion process of AZ91D magnesium alloy in neutral 1% （mass fraction） sodium chloride aqueous solution was investigated by electrochemical noise（EN）, SEM and EDX. Fractal theory was primarily used to depict the corrosion process of the alloy. The fast wavelet transform（FWT）, as well as the fast Fourier transform（FFT）, was employed to analyze the EN data. The results show that the overall corrosion process can be described by three stages. The first stage corresponds to the pit nucleation and growth; the second stage involves the growth of a passive oxide layer; and the third stage involves reactivation. With increasing immersion time, fractal dimension increases fast initially, fluctuates in the medium and increases again at last. Pitting corrosion and fractal dimension increase due to the initiation and formation of pits in the initial and the end of immersion, while depresses due to the passivation in the medium period. The results of SEM and EDX support the above conclusions.