壳聚糖季铵盐在HCl溶液中对Q235钢的缓蚀性能  

Corrosion Inhibition Property of Quaternary Ammonium Salt of Chitosan on Q235 Steel in 0.5 M HCl Solution

作　　者：王秀梅[1] 万晔[1] 范兆荣[1] 李晓[1] 

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168

出　　处：《材料保护》2016年第6期16-21,6,共6页Materials Protection

基　　金：住房和城乡建设部项目(2014-K4-020)资助

摘　　要：目前，关于壳聚糖类缓蚀剂的报道较少，且研究温度窄，鲜见对其吸附动力学参数的分析。合成了羟丙基三甲基氯化铵壳聚糖（HACC），在30-60℃温度范围内，通过浸泡失重、电化学分析、形貌观察等方法研究了其在O．5mol／LHCl溶液中对Q235钢的缓蚀效果。结果表明：缓蚀效率随HACC浓度升高而增加，随温度升高而降低，在30℃、HACC浓度为1．5mmol／L时，缓蚀效率最高；HACC同时抑制了Q235钢腐蚀的阴阳极过程，通过抑制反应的活性点而起缓蚀作用；HACC在Q235钢表面的吸附符合Langmuir等温吸附模型，是自发的放热过程，属于物理和化学混合吸附，活化能是Q235钢腐蚀速率的决定性因素。Quaternary ammonium salt of chitosan(HACC) was synthesized.Afterwards,the corrosion inhibition efficiency of HACC on Q235 steel in 0.5 M HCl solution at 30~60 ℃ was investigated by immersion weight loss,electrochemical analysis and morphology observation.Results showed that the inhibition efficiency increased with the increase of HACC concentrations but decreased with the increase of temperature.When the temperature was 30℃ and the HACC concentration was 1.5 mmol/L,the inhibition efficiency was up to the maximum.In addition,HACC both inhibited cathodic and anodic processes of the corrosion of Q235 steel by controlling the activities of reaction.The absorption of HACC on the surface of Q235 steel followed the Langmuir adsorption isotherm and was spontaneous exothermic process,which belonged to mixture of physical and chemical adsorption.Besides,the activation energy was the decisive factor affecting the corrosion rale of Q235 steel.

关 键 词：壳聚糖季铵盐缓蚀剂 Langmuir等温吸附 HCL溶液 Q235钢 缓蚀性能 

分 类 号：TG174.42[金属学及工艺—金属表面处理]