Effects of inorganic additions on the performance of manganese-based conversion treatments

被引：26

作者：

Danilidis, I.

Hunter, J.

Scamans, G. M.

Sykes, J. M.

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[2] Novelis Global Technol Ctr, Kingston, ON K7L 5L9, Canada

[3] Innoval Technol Ltd, Banbury OX16 1TQ, Oxon, England

来源：

CORROSION SCIENCE | 2007年 / 49卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

aluminium; permanganate; polarisation; pitting corrosion; oxide coating;

D O I：

10.1016/j.corsci.2006.08.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electrochemical behaviour of permanganate-based no-rinse conversion coatings on AA3003H14 aluminium alloy shows that they have promise as an alternative to toxic chromate-based coatings. A selection of inorganic additions has been made here to a simple 0.1 M KMnO4 formulation investigated previously. The performance of the different coatings has been evaluated from potential-time and polarisation measurements in 0.5 wt % (0.085 M) NaCl solution for periods up to 3 days. The addition of fluoride ions produced no benefit, whereas Al(NO3)(3) shows an improvement when added in small amounts. Tests with the individual ions reveal that it is Al3+ cations, rather than NO3- anions, which produce the greatest benefit. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1559 / 1569

页数：11

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