Rapid Evaluation for Aging of Aluminum Alloys by Chronoamperometry

近年来，由于汽车、飞机等车辆经常在高速行驶的情况下使用，因此为了提高强度/重量比，人们正在研究汽车、飞机等材料。因此，对铝合金也提出了高强度的要求。它的强度是由于老化而实现的。然后我开始了这项研究，三年前开始了铝合金时效的电化学评估。本研究采用循环伏安法、计时电流法和计时电位法作为电化学技术。1.用循环伏安法、计时电流法和计时滴定法研究了飞机用铝锌镁合金的老化行为。对汽车活塞用多元铝合金Al-Si-Cu-Ni-Mg合金的时效行为进行了电化学研究。研究了计时电位法和计时电流法的可能性。将前者应用于铝镁合金的时效测量。采用计时电流法等多种电化学技术对SUS316钢和SUS304钢进行了敏化处理。将不同的电化学技术应用于沥青和聚丙烯腈纤维基碳/碳复合材料的石墨化过程，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来评价各种金属材料在加热过程中的转变。

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.