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首页> 外文期刊>Journal of Materials Engineering and Performance >Corrosion Behavior of AZ31 Magnesium Alloy Produced by Continuous Variable Cross Section Direct Extrusion
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Corrosion Behavior of AZ31 Magnesium Alloy Produced by Continuous Variable Cross Section Direct Extrusion

机译：连续横截面直接挤压生产AZ31镁合金的腐蚀行为

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摘要

In order to study the corrosion behavior of magnesium alloys of high performance in the simulated seawater by continuous variable cross section direct extrusion (CVCDE), an electrochemical method and weight loss method were used to study the difference between AZ31 magnesium alloys produced by CVCDE with different numbers of interim dies to examine the electrochemical corrosion behavior and corrosion rate at 3.5 wt.% NaCl solution in this paper. Scanning electron microscopy and x-ray diffraction were used to analyze the morphology of corrosion surfaces and the composition of the corrosion products of samples soaked for different times. The results show that after CVCDE with different numbers of interim dies, the size of the microstructure is refined gradually, and the grain orientation is also different; with the increase in the number of interim dies, the thermodynamic corrosion tendencies are different, and the corrosion resistance of samples extruded by conventional extrusion is relatively good; the charge transfer and material transfer process are the two main factors affecting the corrosion rate, which determines the direction of the electrochemical reaction; the corrosion form of the sample extruded by CVCDE is the local corrosion which is the filiform corrosion and pitting corrosion, and the corrosion product is mainly water-insoluble Mg(OH)(2).
机译：为了通过连续可变横截面直接挤出（CVCDE）研究模拟海水中高性能镁合金的腐蚀行为，使用电化学方法和减肥方法研究CVCDE与不同的AZ31镁合金之间的差异在本文中检查电化学腐蚀行为和3.5重量％的电化学腐蚀行为和腐蚀速率。扫描电子显微镜和X射线衍射用于分析腐蚀表面的形态和浸泡不同时间的样品的腐蚀产物的组成。结果表明，在具有不同数量的临时模具的CVCDE之后，微观结构的尺寸逐渐精制，晶粒取向也不同;随着临时死亡数量的增加，热力学腐蚀趋势是不同的，并且通过常规挤出挤出的样品的耐腐蚀性相对较好;电荷转移和材料转移过程是影响腐蚀速率的两个主要因素，其决定了电化学反应的方向;通过CVCDE挤出的样品的腐蚀形式是局部腐蚀，其是丝状腐蚀和蚀腐蚀，腐蚀产物主要是水不溶性Mg（OH）（2）。

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