The Research of Aluminum Alloy 7175 Corrosion Behavior in Chemical Solution Environments

• Main Authors: Li, I-Wei, 黎奕瑋
• Other Authors: Shih, Han-Chang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/60781833312927054149

碩士 === 中國文化大學 === 化學工程與材料工程學系奈米材料碩士班 === 102 === This study investigated the corrosion effects of aluminum alloy 7175 in aqueous solutions containing three different salts. Experiments were conducted on electrochemical three-electrode system. Surface morphology and the anodic polarization curve (pitting potential ,Epit ) were obtained. Experiment result showed that fluoride and chloride ions had significant effect on pitting corrosion. Therefore, more further explore the phenomenon of fluoride ions、chloride ions and other effects on pitting corrosion. Three different solutions containing 0.01, 0.05 and 0.1M NaCl、NH4Cl and NaF were used. The effect of temperature on polarization was also measured for aluminum alloy 7175 in these solutions. The results indicated that aluminum alloy 7175 was pitting at room temperature, in the condition of any concentrations and solutions about this investigation. Lower pitting potential (Epit) were found for all solutions as the temperature was controlled higher than room temperature. From SEM graphs, we could see that the higher concentration of ions dissolve in the solutions, the more counts and deeper damage of pitting corrosion were found. Therefore, it is concluded that the concentration of Na+、NH4+、F－and Cl－ plays a significant role on pitting corrosion of aluminum alloy 7175.