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Corrosion of structural constituents of 2017 aluminium alloy in acidic solutions containing inhibitors
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-12-10 , DOI: 10.1002/maco.202012046
Przemysław Kwolek 1 , Grażyna Mrówka‐Nowotnik 1 , Magdalena Wytrwal‐Sarna 2
Affiliation  

The objective of this study is to establish the corrosion behaviour of the most important structural constituents of the aluminium alloy 2017 in orthophosphoric acid solutions containing heteropolyoxomolybdate, tungstate and vanadate. These are potential candidates for replacing toxic hexavalent chromium species in stripping solution for anodic coatings. The corrosion rate of the alloy is estimated with linear polarisation method. It decreases from 0.58 mA cm−2 in uninhibited solution to 0.10 mA cm−2 in a solution containing heteropolyoxomolybdate species. Microscopic studies reveal that heteropolyoxomolybdate species inhibit corrosion of the matrix and intermetallic Al15(Fe,Mn)3(Si,Cu)2 but not Mg2Si. Intermetallic Al2Cu remains not corroded. Heteropolyoxotungstate species virtually do not inhibit the corrosion of the alloy. The solution containing vanadium species is not stable with time and the corrosion rate is not determined. Nevertheless, corrosion of the matrix is inhibited, but intermetallics Al15(Fe,Mn)3(Si,Cu)2 together with Mg2Si are dissolved. X‐ray photoelectron spectroscopy is used for examination of a corrosion product precipitated on the surface.

中文翻译:

含抑制剂的酸性溶液中2017铝合金结构成分的腐蚀

这项研究的目的是确定铝合金2017最重要的结构成分在含有杂多氧钼酸盐,钨酸盐和钒酸盐的正磷酸溶液中的腐蚀行为。这些是替代阳极涂层剥离溶液中有毒六价铬物种的潜在候选者。用线性极化法估算合金的腐蚀速率。它从未抑制溶液中的0.58 mA cm -2降低到包含杂多钼酸酯物质的溶液中的0.10 mA cm -2。显微研究表明,杂多氧钼酸盐物质抑制了基体和金属间化合物Al 15(Fe,Mn)3(Si,Cu)2的腐蚀,但不抑制Mg的腐蚀。2 Si。金属间的Al 2 Cu保持不被腐蚀。杂多氧钨酸盐物质实际上不抑制合金的腐蚀。含钒物质的溶液随时间推移不稳定,并且无法确定腐蚀速率。然而,基体的腐蚀被抑制,但是金属间化合物Al 15(Fe,Mn)3(Si,Cu)2与Mg 2 Si一起溶解。X射线光电子能谱用于检查沉淀在表面上的腐蚀产物。
更新日期:2020-12-10
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