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Passivation behaviors of 6082 aluminium alloy under stress corrosion process
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-08-30 , DOI: 10.1002/maco.202011699 Bin Zhou 1 , Li Yang 1 , Shou‐bing Yang 1 , Chi Zhang 1 , Yan‐zhou Li 1 , Di Bai 1 , Gen‐zhe Huang 1
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-08-30 , DOI: 10.1002/maco.202011699 Bin Zhou 1 , Li Yang 1 , Shou‐bing Yang 1 , Chi Zhang 1 , Yan‐zhou Li 1 , Di Bai 1 , Gen‐zhe Huang 1
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We systematically studied the passivation process of 6082 aluminium alloy under the bending stress situation by combining electrochemical measurement techniques with three‐point bending stress fixture designed by our lab, and then examined the microstructures of corroded specimens to analyze electrochemical corrosion mechanism in 1.5% NaCl solution. The results show that secondary Mg2Si phase acts as the anodic electrode, leading to the self‐corrosion of Mg2Si phase. As a result, the spots of self‐corroded Mg2Si phase within grains act as initial pitting corrosion site, combined with tiny, massive precipitated Mg2Si particles at the grain boundaries and bending stress, leading to the failure of surface of the 6082 aluminium alloy. The corrosion current density increases from 3.422 × 10−7 to 13.77 × 10−7 A/cm2 when bending stress level was increased from 0% up to 100% of yield stress. Passive film formation process occurred between polarization potential area of −1.05 and −0.65 V. Sectional microstructural investigations show that the corrosion starts penetrating vertically into the material before it develops corrosion paths extending parallel to the surface, leading to massive stress‐induced corrosion cracks. The maximum corrosion depth increases from ∼24 μm on specimen without any stress applied to 85 μm when bending stress of 100% yield strength is applied.
中文翻译：
6082铝合金在应力腐蚀过程中的钝化行为
通过将电化学测量技术与我所设计的三点弯曲应力夹具相结合，系统地研究了6082铝合金在弯曲应力情况下的钝化过程，然后研究了腐蚀试样的微观结构，以分析在1.5％NaCl溶液中的电化学腐蚀机理。 。结果表明，二次Mg 2 Si相充当阳极电极，导致Mg 2 Si相自腐蚀。结果，晶粒内自腐蚀的Mg 2 Si相成为初始的点蚀腐蚀点，并伴随着微小的块状Mg 2沉淀。Si颗粒在晶界处和弯曲应力作用下，导致6082铝合金表面失效。当弯曲应力水平从0％增大到屈服应力的100％时，腐蚀电流密度从3.422×10 -7增加到13.77×10 -7 A / cm 2。钝化膜的形成过程发生在极化电势区域的-1.05和-0.65 V之间。截面的微观结构研究表明，腐蚀开始垂直渗透到材料中，然后才形成平行于表面的腐蚀路径，从而导致大量应力引起的腐蚀裂纹。当施加100％屈服强度的弯曲应力时，最大腐蚀深度从不施加任何应力的试样上的〜24μm增加到85μm。
更新日期：2020-08-30
中文翻译：
6082铝合金在应力腐蚀过程中的钝化行为
通过将电化学测量技术与我所设计的三点弯曲应力夹具相结合，系统地研究了6082铝合金在弯曲应力情况下的钝化过程，然后研究了腐蚀试样的微观结构，以分析在1.5％NaCl溶液中的电化学腐蚀机理。 。结果表明，二次Mg 2 Si相充当阳极电极，导致Mg 2 Si相自腐蚀。结果，晶粒内自腐蚀的Mg 2 Si相成为初始的点蚀腐蚀点，并伴随着微小的块状Mg 2沉淀。Si颗粒在晶界处和弯曲应力作用下，导致6082铝合金表面失效。当弯曲应力水平从0％增大到屈服应力的100％时，腐蚀电流密度从3.422×10 -7增加到13.77×10 -7 A / cm 2。钝化膜的形成过程发生在极化电势区域的-1.05和-0.65 V之间。截面的微观结构研究表明，腐蚀开始垂直渗透到材料中，然后才形成平行于表面的腐蚀路径，从而导致大量应力引起的腐蚀裂纹。当施加100％屈服强度的弯曲应力时，最大腐蚀深度从不施加任何应力的试样上的〜24μm增加到85μm。
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