摘要
本文采用失重法、电化学测试技术、EDAX能谱和X-射线衍射等方法考察了Na2MoO4-B复合缓蚀剂对55%LiBr+0.07 mol/L LiOH溶液中碳钢的缓蚀行为.结果表明,240℃时添加800 mg/L Na2MoO4-B复合缓蚀剂的55%LiBr+0.07 mol/L LiOH溶液中碳钢腐蚀速度为44.11μm/a.沸腾的55%LiBr+0.07mol/L LiOH溶液中添加复合缓蚀剂后碳钢电化学性能明显改善,腐蚀电位正移,钝化电位区间拓宽,钝化电流密度降低,常相位角元件CPE的Y0值减小,反应电阻Rt值增加,缓蚀效率可达98.88%.Na2MoO4-B复合缓蚀剂中的B缓蚀剂可使55%LiBr溶液中Na2MoO4的溶解度提高至800 mg/L以上.Na2MoO4通过氧化作用可使碳钢表面形成一层主要由Fe3O4、MoO2和MoO3组成的致密钝化膜,从而起到较好的缓蚀作用.
The aim of the present study was to investigate the effect of Na2MoO4 - B complex inhibitor on the corrosion of carbon steel in 55% LiBr ＋ 0.07 mol/L LiOH solution by weight-loss tests, electrochemical measurements, SEM, XRD and EDAX . The results show that NazMoO4 -B complex inhibitor behaves as an ex cellent inhibition performance in the solution . When its concentration reached 8 0 0 mg / L in 5 5 % LiBr ＋ 0.07 mol/L LiOH solution at 240 ℃, the carbon steel＇s corrosion rate decreased to 44.1 μm/a, the anodic passivation region broadened and the passive current density of carbon steel decreased. At the same time, the capacitance value of electric double layer decreased and the charge transfer resistance increased. The inhibition efficiency of 800 mg/L Na2MoO4 - B complex inhibitor is 98.88% at the boiling temperature. The concentration of NazMoO4 could reach 800 mg/L when NazMoO4 - B complex inhibitor was added to 55% LiBr ＋ 0.07 mol/L LiOH solution. The compact compound film, which formed on the surface of carbon steel when adding Na2MoO4 -B complex inhibitor （800 rag/L） into 55% LiBr ＋0.07 mol/L LiOH solution, and that was mainly composed of iron oxide and molybdenum oxide, improved carbon steel＇ s anti-corrosion property.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2013年第5期134-138,共5页
Materials Science and Technology
基金
国家高技术研究发展计划资助项目(2006AA11A134)
关键词
溴化锂
碳钢
钼酸钠
有机膦
LiBr
carbon steel
molybdate
organophosphonate
