Development of Coupling Analysis Method of Electric Field and Stress Field to Predict Corrosion Rate in Corrosion Fatigue

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289004
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: University of Fukui
• Principal Investigator: Kuwazuru Osamu 福井大学, 学術研究院工学系部門, 准教授 (40334362)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 環境強度 / 腐食疲労 / 応力腐食割れ / 腐食電場解析 / 腐食／応力連成解析 / 分極曲線 / 応力腐食

Outline of Final Research Achievements

Aiming at the development of corrosion-stress coupling analysis method, a new methodology to evaluate the effect of stress on electrochemical property was established. Although the coupling analysis code could not developed since the examination of experimental conditions required an excessive time, a method to evaluate the polarization curve of microscopically-damaged potion of oxide film by using a damage model. We measured the variation of polarization curve of the cast aluminum alloy by the effect of stress in sodium chloride solution, and found that the spontaneous potential decreased about 40 mV under the influence of stress. The casting skin has lower spontaneous potential than the polished surface, and easy to corrode by the effect of stress. Moreover, as a result of boundary-element electric field analysis on the damaged oxide film, we found that the damaged potion of oxide film has about 120 mV lower spontaneous potential than the intact potion.

Free Research Field

計算固体力学