用线性极化法研究了０．１０ｍｏｌ／ＬＨ２ＳＯ４溶液中乌洛托品、ＡＴＭＰ（氨基三甲叉膦酸）、ＭＡＤＭＰ（甲胺二甲叉膦酸）、ＢＡＤＭＰ（正丁胺二甲叉膦酸）和ｎＨＥＤＰ（羟基乙叉二膦酸）的缓蚀作用．结果发现，三种甲叉膦酸－ＡＴＭＰ、ＭＡＤＭＰ和ＢＡＤＭＰ对１Ｃｒ１３不锈钢均有明显的缓蚀作用，其缓蚀率远大于乌洛托品和ＨＥＤＰ．三种甲叉膦酸都属于混合型缓蚀剂，其吸附服从Ｌａｎｇｍｕｉｒ吸附等温式，吸附的平衡常数分别为２．６７×１０３Ｌ／ｍｏｌ（ＡＴＭＰ）、０．８５×１０３Ｌ／ｍｏｌ（ＭＡＤＭＰ）和０．５５×１０３Ｌ／ｍｏｌ（ＢＡＤＭＰ）分子中各官能团对缓蚀作用贡献大小的次序为：－ＣＨ２ＰＯ（ＯＨ）２＞－ＣＨ３＞－ｎＣ４Ｈ９。
Corrosion inhibition of ATMP(aminotrimethylene phosphonic acid),MADMP(methylaminodimethy lene phosphonic acid),BADMP(n-butyl-aminodimethylene phosphonic acid) and HEDP(1-hydroxyethylidene 1,1-diphosphonic acid) for 1Cr13 stainless steel in deaerated 0.10 mol/L H2SO4 at 30℃ was studied by linear polarization method. It is found that the corrosion inhibition of these met hyle nephosphonic acidswith R-N-[CH2PO(OH)2]2 structure is much better than of urotropine(hexameth lenetetramine).They act as mixed type(ano-cathodic) corrosion inhibitors.Their adsorption obeys Langmuir isotherm equation,and the adsorption equilibrium constants are 2.67×103,0.85×103 and 0.55×103 L/mol for ATMP,MADMP and BADMP respectively.According to their contribution to corrosion inhibition,the functionalgroups in these methylenephosphonic acid molecules may be arranged as:-CH2PO(OH)2 -CH3 -nC4H9.
参考文献
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