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采用电偶 极化 和恒 电 位 极化 等 电化 学 方 法,评 价 1 Cr18 Ni9 Ti 不锈 钢 阳 极 钝 化膜 和 S U S36 不 锈钢原 始钝化膜 在70 ℃的 维尼纶醛 化液{ H2 S O4(240 g/l + Na2 S O4( 70 g/l) + H C H O(25g/l) + [ Fe3 + ](3 5 .4 ×106) + [ Cl](24 0 m g/l)} 中 的自 钝能 力,探 讨醛 化 液组 分、 Fe3 + 、 Cl等 因 素对不锈钢 钝化的影 响.发现 它们的 钝态 - 活态 面积 比 在临 界值 内, 都有 活/ 钝 态 的转 变.实 验 结 果表明了钝 态不锈钢 设备在 缩醛化的 生产 工艺 操 作中 ,因 机械 损 伤造 成钝 化 膜的 局部 破 损,在 一 定的条件上 ,可通过 钝态_ 活态电偶 对的极 化作用,使 局部活 化表面膜 修补致 钝,防止设 备的局 部腐蚀发生.
Electrochemical methods such as electric dipole polarization and potentiostatic polarization were used to evaluate the corrosion resistance of 1Vr18 Ni9 Ti stainless steel anode passivation film and S U S36 stainless steel original passivation film at 70 ℃ / L + Na2S O4 (70 g / l) + H C H O (25 g / l) + [Fe3 +] (3.54 × 10-6) + [Cl-] (24 0 m g / l) } In the self-blunt ability to discuss the composition of hydrofluoric acid solution, Fe3 +, Cl and other factors on stainless steel passivation. Found that their passivation - live area ratio within the critical value, both live / passive The results show that the passive stainless steel equipment in the acetalization of the production process operation, due to mechanical damage caused by the local damage of the passive film, under certain conditions, passivated _ live galvanic couple polarization The role of local activation of the membrane repair blunt, to prevent the equipment bureau Corrosion occurs.