The inhibition by dodecylamine of enhanced dissolution of CuNi alloy initiated by an AFM tipsurface interaction

• Published in: Anti-corrosion methods and materials 2005-12, Vol.52 (6), p.323-327
• Main Authors: Qu, JunE, Guo, XingPeng, Chen, ZhenYu
• Format: Article
• Language: English
• Subjects: Alloys; Corrosion; Inhibitors; Metals
• ISSN: 0003-5599
• DOI: 10.1108/00035590510624659

Purpose To investigate the influence of an organic corrosion inhibitor on the enhanced dissolution of metal, initiated by AFM tip scratching in corrosive media. Designmethodologyapproach The test solutions were 1.5M NaCl and 0.01M HCl. AFM tip scratching experiments were performed for CuNi alloys in solutions with or without 0.005M dodecylamine. AFM frictional loop tests were also performed to investigate the effect of dodecylamine on the tipsurface frictional interaction. Findings Enhanced dissolution of CuNi alloy was observed as a result of AFM tip scratching both in NaCl and HCl solutions, and in HCl the effect was more severe than was the case in NaCl. Enhanced dissolution was inhibited markedly by adding 0.005M dodecylamine to the corrosive media. The results of frictional loop tests indicated that frictional interaction between the tip and the alloy surface was diminished by the adsorption of dodecylamine on the sample surface. The weakening of tipsurface frictional interaction and the elevation of the ionization energy of metal atoms were responsible for the notable inhibition effect of dodecylamine on the accelerated dissolution. Originalityvalue In this paper, the influence of an organic corrosion inhibitor on the corrosion of metal induced by outside forces was investigated. This was carried out initially by AFM scratching skill and the inhibition mechanism of dodecylamine on the enhanced dissolution of CuNi alloy initiated by AFM tip scratching.