Electrochemical Noise Study on Galvanic Corrosion of Aluminum Alloy in Chloride Environments- Effect of Oxide Film Structure

Sakairi, Masatoshi; Shimoyama, Yukiya; Takahashi, Hiroki

doi:10.1149/1.2215503

Cited by 3 publications

References 18 publications

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Crevice-Galvanic Corrosion in Aluminium Shower Curtain Poles

Birol

2010

Practical Metallography

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Light microscopy, scanning electron microscopy and energy dispersive X-ray analysis were employed to identify the key factors responsible for the crevice-galvanic corrosion of shower curtain poles produced from EN AW-6060 alloy. The corrosion process has started between the aluminium poles and the metallized plastic hooks used to hang the shower curtains on the poles. The highly alkaline bathroom cleaning agent has penetrated between the aluminium profile and the plastic hooks leading to the dissolution of the unusually thin anodic oxide layer. The aluminium profile which has been stripped of its anodic oxide locally via crevice corrosion is then allowed to contact the Ni-, Cr- and Cubearing coating of the plastic hooks. The corrosion process has accelerated due to a galvanic couple effect as evidenced by the analysis of the corroded regions where Cu and Ni were abundant.

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Crevice-Galvanic Corrosion in Aluminium Shower Curtain Poles

Birol

2010

Practical Metallography

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Galvanic Corrosion of Anodized Aluminum-Influence of Anodic Oxide Film Structure and Concentration of Cl--

Sakairi¹,

Shimoyama²,

Nagasawa³

et al. 2008

ZAKAEP

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The effect of anodic oxide film structure, barrier type and porous type on galvanic corrosion resistance of aluminum in 0.5 kmol/m 3 H 3 BO 3 / 0.05 kmol/m 3 Na 2 B 4 O 7 with NaCl was examined by electrochemical random signal (electrochemical noise) analysis technique. When pitting corrosion occurs, rest potential suddenly decreases and current increases rapidly, and rest potential and current change with fluctuation during galvanic corrosion. The galvanic current change correlates closely with corrosion potential change. As the thickness of both types of anodic oxide films and decreasing of chloride ion concentration, the incubation time of pitting corrosion became longer, and incubation time of pitting corrosion of specimen formed porous type anodic oxide film is longer than that of specimen formed barrier type anodic oxide film. The inverse of incubation time increase with chloride ion concentration to the power of n, Cl n . The value of n is between 1.2 and 2.5 in both oxide films.

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