Rapid Evaluation for Aging of Aluminum Alloys by Chronoamperometry

近年来，由于汽车、飞机等经常在高速情况下使用，因此研究了用于汽车、飞机等的材料以提高强度重量比。因此，对铝合金也要求高强度。其强度是由于老化而实现的。三年前，我开始了铝合金老化的电化学评估研究。在本研究中，循环伏安法，计时电流法和计时电位法被用作电化学技术的目的。在1995年至1997年这3年中，取得了以下5点：1.采用循环伏安法、计时电流法和计时电位法研究了航空用Al-Zn-Mg合金的时效行为.对汽车活塞用多元铝合金Al-Si-Cu-Ni-Mg合金的时效进行了电化学研究.研究了计时电位法和计时电流法的可能性。将前一种技术应用于Al-Mg合金时效的测试.采用计时电流法等电化学方法对SUS 316钢和SUS 304钢进行了敏化研究.研究结果表明，计时电流法、计时电位法和循环伏安法等电化学技术可以用于评价各种金属材料的热致相变。

Recently, materials for automobiles, aircraft etc. are investigated for the improvement of strength to weight ratio, since the vehicles are often used in the situation of high speed. Therefore, the high strength is also required for aluminum alloys. Its strength is realized due to aging. Then I started this study where electrochemical evaluation for aging of aluminum alloys three years ago. In this study, cyclic voltammetry, chronoamperometry and chronopotentiometry were utilized as electrochemical technique for the purpose. In these three years between 1995 and 1997, the following five points were obtained :1. The aging of Al-Zn-Mg alloys utilized for aircraft was investigated, using cyclic voltammetry, chronoamperometry and chronopotetiometry.2. The aging of Multicomponent aluminum alloys, Al-Si-Cu-Ni-Mg alloys utilized for automobile pistons was investigated electrochemically.3. The possibility of chronopotentiometry as well as that of chronoamperometry was investigated. The former technique was applied to the mesaurement of aging for Al-Mg alloys.4. Various ekectrochemical techniques like chronoamperometry were also applied to the sensitization of SUS 316 steels as well as that of SUS304 steels.5. Various electrochemical techniques were also applied to the graphitization of carbon-carbon composites based on Pitch and PAN fibers.All of these results indicate that various electrochemical techniques like chronoamperometry, chronopotentiometry and cyclic voltammetry can be applied to evaluate for the transformation of various metallic materials induced by heating.