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INFLUENCE OF TWO-ALKALI METHOD ON CORROSION BEHAVIOR FOR TITANIUM IN BITTERN SOLUTION |
GONG Min; JIANG Wei; ZOU Zhen; CHEN Jian; LIANG Gang |
College of Materials and Chemical Engineering; Sichuan University of Science and Engineering;Zigong 643000 |
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Abstract The influence of the resistance to corrosion behavior was studied for industrial titanium in bittern solution under the different concentrations of CO32- and the different values of pH and the different temperatures by electrochemical method and electrochemical impedance spectra and the weight loss in coupon tests in this paper. Electrode process was discussed and impedance was analyzed. The corrosion images were observed by metallurgical microscope after the mass loss tests. The results showed that the resistance to corrosion enhanced obviously for the metal system decreased gradually with increasing the concentration of CO32- and increasing the pH value, and decreased with rising up temperature. The resistance to corrosion enhanced first and then decreased oppositely with increasing the immersion time and the value of Vp was the biggest after 7 days immersion for titanium in bittern solution. The electrode reaction was irreversible and controlled by both activation polarization and diffusiveness for titanium in bittern medium.
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Received: 30 July 2007
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Corresponding Authors:
JIANG Wei
E-mail: ilyjiangwei@126.com
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