Cl<sup>-</sup>和H<sup>+</sup>对2024-T3铝合金初期腐蚀的协同效应

doi:10.11896/j.issn.1005-023X.2018.09.021

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Abstract The present work aims to explore the dual-factor synergistic effect of Cl^- and H⁺ concentrations. We obtained the polarization curve, open circuit potential and micro morphology of 2024-T3 aluminum alloy in aqueous solution with different Cl^- and H⁺ concentrations by means of electrochemical workstation, optical microscopy and scanning electron microscopy. A mathematical model was established for the analysis of dual-factor synergistic effect, and the main effect, synergistic effect and simple effect of Cl^- and H⁺ concentrations on the alloy’s corrosion rate in the initial stage were quantified. We observed a corrosion acceleration but an unchanged apparent corrosion morphology while increased Cl^- and H⁺ concentrations. It can be concluded that, the main effect and synergistic effect of Cl^- and H⁺ concentrations on the corrosion rate are significant with the confidence level of 0.005, and the order from main to subordinate is H⁺, Cl^- and H⁺×Cl^-, and also there are significant differences between the simple effects of the two factors. In the initial stage, Cl^- and H⁺ affect the corrosion behavior of aluminum alloy by changing the passive film properties. Under different concentration levels, the disintegration of the passive film is dominated by distinct reactions: the dissolution damage under high H⁺ concentration and the synergistic destruction of Cl^- and H⁺ under low H⁺ concentration.

Key words： Cl^- and H⁺ aluminum alloy initial corrosion synergistic effect

Published: 06 July 2018

CLC number:

V252.2

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	Articles by authors
	CHEN Yueliang
	WANG Andong
	ZHANG Yong
	BIAN Guixue
	HUANG Hailiang

Cite this article:

CHEN Yueliang,WANG Andong,ZHANG Yong, et al. The Synergistic Effect of Cl^- and H⁺ on Initial Corrosion of 2024-T3 Aluminum Alloy[J]. Materials Reports, 2018, 32(9): 1549-1556.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.09.021 OR http://www.mater-rep.com/EN/Y2018/V32/I9/1549

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