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首页> 外文期刊>Corrosion Engineering, Science and Technology >Effect of cathodic polarisation on pitting corrosion of AA5083-H321 aluminium-magnesium alloy in stagnant 3·5% NaCl solution
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Effect of cathodic polarisation on pitting corrosion of AA5083-H321 aluminium-magnesium alloy in stagnant 3·5% NaCl solution

机译：阴极极化对停滞3·5％NaCl溶液中AA5083-H321铝镁合金点蚀的影响

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摘要

Aluminium-magnesium alloy AA5083-H321 is a suitable material for construction of high speed boats, submarines, desalination systems etc. Cathodic protection is the proposed method for protection against its pitting corrosion. In this research, cathodic polarisation of this alloy has been studied in stationary 3·5% sodium chloride solution at -0·9, -1, -1·1 and -1·2 V(SCE). The electrochemical behaviour of the surface was investigated with EIS and DC methods. Morphological changes on the surface and cross-section of the samples were studied using scanning electron microscope (SEM) and EDAX analyser. The results showed that the fraction of the surface covered by pits, increases with applying more negative potentials. More alkaline electrolyte inside the pits on the surface tends to show non-ideal behaviour for capacitance inside the oxide layer and for oxide layer/solution interface. This behaviour is intensified with increasing of negative potential by deepening of pits during cathodic polarisation of the alloy. The final result is that cathodic protection of this alloy immersed in stationary conditions is impossible.
机译：铝镁合金AA5083-H321是用于建造高速船，潜艇，海水淡化系统等的合适材料。阴极保护是防止点蚀的一种建议方法。在这项研究中，该合金的阴极极化已在固定的3·5％氯化钠溶液中于-0·9，-1，-1·1和-1·2 V（SCE）下进行了研究。用EIS和DC方法研究了表面的电化学行为。使用扫描电子显微镜（SEM）和EDAX分析仪研究了样品表面和横截面的形态变化。结果表明，凹坑所覆盖的表面分数随着施加更多的负电势而增加。表面上的凹坑内更多的碱性电解质趋于对氧化物层内部的电容以及氧化物层/溶液界面显示出不理想的行为。通过在合金的阴极极化期间加深凹坑，这种行为会随着负电位的增加而增强。最终结果是不可能对浸没在固定条件下的这种合金进行阴极保护。

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