苯并三氮唑对BFe30—11在单相及含砂人工海水中冲刷腐蚀的抑制作用

采用旋转圆筒式冲刷装置通过多种电化学测试及失重测量研究了苯并三氮唑对ＢＦｅ３０－１－１在单相及含砂人工海水中冲刷腐蚀的抑制作用。结果表明，ＢＴＡ可有效抑制ＢＦｅ３０－１－１在单相及含砂人工海水中冲腐蚀的阴，阳极反应，属几何覆盖型缓蚀剂，其只附满足Ｌａｎｇｍｉｕｒ等温式。ＢＴＡ在单相流动海水中比静态下缓蚀作用更强，但流速较高时，ＢＴＡ缓蚀作用下降；在含砂人工海水中，ＢＴＡ缓蚀作用随砂含量的增加而降低

EFFECT OF BTA ON EROSION CORROSION INHIBITION OF BFe30 1 1 IN SINGLE ANDSAND CONTAINING ARTIFICIAL SEAWATER

The inhibition of BTA from erosion corrosion of BFe30 1 1 in single andsand containing artificial seawater have been investigated usingrotating cylinder apparatus. The methods adopted in the experimentswere weight loss and electrochemical measurements including linearpolarization resistance and potentiodynamic scanning as well aselectrochemical impedance spectroscopy. The results showed that BTA couldsignificantly retarded both the anodic and cathodic reactions ofBFe30 1 1 in the media by geometric blocking effect. The adsorption ofBTA on the alloy followed Langmiur isotherm. BTA showed betterinhibition action in flowing seawater than in static seawater. However,the inhibiting action of BTA decreased when the fluid velocity ofartificial seawater was even higher. Furthermore, the inhibitionefficiency of BTA in sand containing artificial seawater decreased withincreasing sand content probably due to the strong mechanical erosionaction of sand against electrode surface.