合成了一种新型有机多元膦酸——N-磺酸基氨基二甲叉膦酸（SADP），研究了它在0.1mol/L硫酸溶液中对0Cr13不锈钢的缓蚀作用,并与另外两种常用的有机多元膦酸:氨基三甲叉膦酸(ATMP)和羟基乙叉二膦酸(HEDP)进行了对比.结果表明:它们对不锈钢的缓蚀作用机理主要是吸附覆盖作用,属于Langmuir吸附;SADP的缓蚀性能优于ATMP和HEDP.其缓蚀能力次序为:ηSADP>ηATMP>ηHEDP.
The corrosion inhibition by SADP(N-sulfonic amino-dimethylene phosphonic acid) on 0Cr13 stainless steel was studied by linear polarization and anodic polarization curve methods in 0.10mol/L H2SO4 solutions, compared with HEDP(1-hydroxyethylidene-1, 1-diphosphonic acid) and ATMP(aminotrimethylenephosphonic acid).It was found that these three phosphonic acids have remarkable inhibition effect on the corrosion of 0Cr13 stainless steel in H2SO4 solutions. The corrosion inhibiton mechanism by SADP、HEDP、ATMP on 0Cr13 was found to be the geometric blocking effect. Results showed that the adsorption of all these three phosphonic acids follows the Langmuir adsorption isotherm. The order in the corrosion inhibition effciency may be arranged as follows:ηSADP>ηATMP>ηHEDP.
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