在MgCl_2溶液中季鏻盐对铝缓蚀作用的影响

INHIBITIVE EFFECT OF PHOSPHONIUM SALTS ON CORROSION OF ALUMINUM

在１ｍｏｌ·Ｌ（－１）ＭｇＣｌ２溶液中应用微分极化电阻和微分电容测量技术研究三种季纾煅位衔锒月恋幕菏醋饔眉凹剧ｌ盐分子结构对缓蚀效率的影响。结果表明，季纾煅位衔锞哂薪虾玫幕菏醋饔茫闯さ募剧ｌ盐比链短的缓蚀效率高。在２５～４５℃内，季鏻盐化合物在铝表面上的吸附服从Ｌａｎｇｍｕｉｒ吸附等温式，且为物理吸附。此外，给出了溴化丁基三甲基（ＢＴＭＰＢ）在铝表面上可能的吸附模型。

The inhibitive effect of three phosphonium salts conmpounds on corrosion of aluminum and the effect of their molecular structure on inhibitive efficiency have been studied by using the differential polarization resistance and differential capacitance measure techniques in 1 mol·L(-1) MgCl2 solution at 25～45℃. The three phosphonium salts all can well inhibit the corrosion of aluminum in MgCl2 solution ,and the inhibitive efficiency of long carbon chain phosphonium salt is higher than that of short carbon chain phosphonium salt. The adsorption of the phosphonium salts follows Langmuir isotherm on the aluminum surface in MgCl2 solution ,and it belongs physical adsorption. Their adsorption thermodynamic functions were calculated. In addition , different possible models of adsorption of BTMPB were put forward.