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采用金属-膜-金属结构测量了黄铜在BTA-PVA(Passivating agent)钝化剂中形成的表面多层化学转化膜的导电性,结果表明:膜为半导体,但因钝化工艺不同,膜的导电能力相差较大。BTA溶液和PVA溶液分步处理得到的膜有2次以上击穿现象发生;BTA+PVA混合液处理的膜表现出良好的导电性,有准金属行为,经含微量六价铬的溶液预钝化后,再在BTA+PVA混合液中钝化,则膜的导电能力介于上面两者之间,有1至2次击穿现象。
The electrical conductivity of the surface multilayer chemical conversion film formed by brass in passivating agent of BTA-PVA (Passivating agent) was measured by the metal-film-metal structure. The results show that the film is a semiconductor, but due to the different passivation process, The conductivity of the larger difference. BTA solution and PVA solution obtained by the step-by-step breakdown of the membrane more than 2 times the breakdown occurred; BTA + PVA mixture treated film showed good conductivity, metalloid behavior, the solution containing a little hexavalent chromium pre-blunt After the passivation, passivated in the BTA + PVA mixture, the conductivity of the membrane is between the two above and there are 1 to 2 breakdown phenomena.