摘要
通过失重法和电化学法探究了溴代十六烷基吡啶(HDPB)在甲基磺酸(CH_(3)SO_(3)H)环境中对冷轧钢(CRS)的腐蚀抑制性能,通过缓蚀溶液表面张力的变化规律探究其与缓蚀性能之间的内在联系,并进一步通过接触角测试和扫描电子显微镜(SEM)探究HDPB在金属表面的吸附机理。结果表明:HDPB对CRS在CH_(3)SO_(3)H中有明显的腐蚀抑制作用,在40℃添加10mg·L^(-1)HDPB时,最高缓蚀率达到96.7%。缓蚀性能随着HDPB浓度的增大而增强,且HDPB在CRS表面的吸附与Langmuir单层吸附模型吻合。在各温度条件下HDPB的|△G^(0)|值介于30.4~40.6kJ·mol^(-1)之间,这表明HDPB在CRS表面的吸附方式是以化学吸附为主的混合吸附。电化学结果表明HDPB为混合型缓蚀剂。随着HDPB浓度的增加,电荷转移电阻增大,从而抑制腐蚀反应的发生。含有HDPB的缓蚀溶液在浸泡CRS6h后表面张力有所增加,这是由于HDPB分子自溶液内部吸附到CRS表面导致的。在含10mg·L^(-1)HDPB的缓蚀体系中浸泡6h后CRS表面的接触角增加至79.35°,较在0.1mol·L^(-1)CH_(4)O_(3)S介质中显著增大,这表明HDPB吸附在CRS表面显著改善表面亲水性。SEM的微观形貌证实了HDPB可以吸附在CRS表面阻隔腐蚀粒子的侵蚀。
The inhibition performance of hexadecylpyridinium bromide(HDPB)on cold rolled steel(CRS)in methanesulfonic acid(CH_(3)SO_(3)H)solution was investigated by weightlessness and electrochemistry.And the intrinsic connection between the change rule of surface tension and inhibition property was investigated.Furthermore,the adsorption mechanism of HDPB on CRS surfaces was investigated through contact angle tests and scanning electron microscopy(SEM).The findings demonstrated that HDPB exhibited a pronounced inhibition effect on CRS in CH_(3)SO_(3)H,and the maximum inhibition effect reaching 96.7% after adding 10 mg·L^(-1) HDPB at 40℃.The inhibition performance was proportional to HDPB concentration,and the adsorption of HDPB on CRS surface followed Langmuir adsorption model.The △G^(0)values of HDPB was between -40.6 and -30.4 kJ·mol^(-1),indicating that the adsorption of HDPB on CRS surface was a mixed adsorption process,dominated by chemisorption.The electrochemical results indicate that HDPB was a mixed inhibitor.The charge transfer resistance increased as HDPB concentration,thus inhibiting the corrosion reaction.The surface tension of the inhibition solution containing HDPB increased after immersion of CRS for 6 h.This was due to the adsorption of HDPB molecules on CRS surface from within the solution.The contact angle of CRS surface increased to 79.35°after immersion in inhibition system containing 10 mg·L^(-1)HDPB for 6 h.This value was significantly larger than that observed in 0.1 mol·L^(-1)CH_(3)SO_(3)H solution.This indicated that the adsorption of HDPB on CRS surface significantly enhanced the surface hydrophobic.The SEM microscopic morphology corroborated that HDPB could be adsorbed on CRS surface,thereby barrier the erosion of corrosive particles.
作者
赵殊璇
魏高飞
仇莉
李向红
ZHAO Shu-xuan;WEI Gao-fei;QIU Li;LI Xiang-hong(College of Materials and Chemical Engineering,Southwest University,Kunming 650224,China;Wuhai Inspection and Testing Center,Wuhai 016000,China;Architectural Engineering Institute of Yancheng Kindergarten Teachers College,Yancheng 224000,China)
出处
《化学研究与应用》
北大核心
2025年第9期2578-2587,共10页
Chemical Research and Application
基金
国家自然科学基金项目(52161016)资助
云南省基础研究计划杰出青年基金项目(202001AV070008)资助
云南省农业基础研究联合专项重点项目(202101BD070001-017)资助
云南省万人计划青年拔尖人才专项项目(51900109)资助。
关键词
溴代十六烷基吡啶
钢
缓蚀性能
吸附
甲基磺酸
hexadecylpyridinium bromide
steel
inhibition
absorption
methylsulphonic acid
