(北京師范大學(xué)低能核物理研究所， 北京市輻射中心， 北京 100875)
摘 要: 研究了LY12鋁合金微弧氧化過(guò)程中工件尺寸變化規(guī)律，并初步分析了氧化膜生長(zhǎng)機(jī)理。氧化膜經(jīng)過(guò)一段時(shí)間的線性增長(zhǎng)后，生長(zhǎng)速度逐漸降低。氧化初始階段向外生長(zhǎng)為主，氧化膜達(dá)到一定厚度后，工件外部尺寸不再增加，而逐漸轉(zhuǎn)向基體內(nèi)部生長(zhǎng)。氧化膜分為疏松層和致密層兩層結(jié)構(gòu)，致密層最終可占到總膜厚的75%以上，打磨掉表面疏松層后，工件基本上能保持原始尺寸。
關(guān)鍵字: 鋁合金 微弧氧化 尺寸變化
（Institute of Low Energy Nuclear Physics, Beijing Normal Univ ersity, Beijing Radiation Center, Beijing 100875）
Abstract:The regularity of size change of samples in process of microarc oxidation of LY12 aluminum alloy was studied, and the formation mechanism of the oxidation film was simply discussed. The growth rate of film decreases gradually after some time with linear growth. The oxidation mainly takes place on the external surface in the initial stage and the geometry size of samples increases, but after this stage, when the oxide film with a certain thickness is formed, the process of oxidation shifts onto substrate. The total thickness of the film continuously increases, but the geometry size of samples would merely change. The oxide film contains loose layer and compact layer, the compact layer can finally be more than 75% of total thickness of film. After the loose layer of surface is ground off, the sample would nearly maintain the same size as the original one.
Key words: aluminum alloy microarc oxidation size change
