Corrosion of Aluminium
Corrosion of Aluminium
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DOI：
10.1002/jctb.5010110503
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发表时间：
2007-05
影响因子：
3.4
通讯作者：
K. F. Lorking;J. Mayne
中科院分区：
文献类型：
--
作者：
K. F. Lorking;J. Mayne
本文研究了铝在室温下在pH值2.0-12.0的九种溶液中的腐蚀。腐蚀更多地取决于阴离子的性质，而不是溶液的pH值。水合和无水氧化铝的溶解度进行了检查，并得出结论，除了在氯离子的存在下，腐蚀与溶液的初始速率的无水氧化物。电位和阳极极化测量表明，而正常的阳极反应是形成无水氧化物，在氯离子，溴离子和碘离子的存在下，形成可溶性铝盐。有人建议，当铝，携带其空气形成的膜，在氧气的存在下浸入溶液中，膜破裂，并开始流动一个小的腐蚀电流。在不存在氯化物和类似离子的情况下，可以发生膜修复，并且铝的行为由膜修复和膜破坏的相对速率控制。在存在氯化物膜的情况下，不会发生修复，一旦膜破裂引发腐蚀，则会迅速进行。如果通过用氧化铝饱和溶液来抑制引发，则腐蚀被抑制。
The corrosion of aluminium at room temperature has been investigated in nine decinormal solutions over the pH range 2.0–12.0. Corrosion was dependent more on the nature of the anion than on the pH of the solution. The solubilities of hydrated and anhydrous aluminium oxide were examined and it was concluded that, except in the presence of chloride ions, corrosion was associated with the initial rate of solution of the anhydrous oxide. Potential and anodic polarisation measurements indicated that whereas the normal anodic reaction is the formation of anhydrous oxide, in the presence of chloride, bromide and iodide ions soluble aluminium salts are formed. It is suggested that when aluminium, carrying its air-formed film, is immersed in a solution in the presence of oxygen, the film breaks down and a small corrosion current commences to flow. In the absence of chlorides, and similar ions, film repair can take place and the behaviour of the aluminium is controlled by the relative rates of film repair and film breakdown. In the presence of chlorides film repair does not occur and once corrosion has been initiated by film breakdown it proceeds apace. If initiation is suppressed, by saturating the solution with aluminium oxide, corrosion is inhibited.