Na2MoO4-有机膦A复合缓蚀剂对55%LiBr溶液中碳钢的缓蚀行为

采用失重法、电化学测试技术、原子力显微镜和电子探针显微分析等方法考察了Na₂MoO₄-有机膦A复合缓蚀剂对55%LiBr+0.07 mol/L LiOH溶液中碳钢的缓蚀性能。结果表明，240 ℃下碳钢在添加800 mg/L Na₂MoO₄-有机膦A复合缓蚀剂的55%LiBr+0.07 mol/L LiOH溶液中的腐蚀速率为43.2 μma^-1。在沸腾的55%LiBr+0.07 mol/L LiOH溶液中添加该缓蚀剂后，碳钢的钝化电位区间拓宽，钝化电流密度降低，反应电阻R_t值显著增加，缓蚀效率可达94.4%。该缓蚀剂能使碳钢表面形成显微结构为孤岛状的膜层，主要成分为Fe和Mo的氧化物。

Corrosion Inhibition Behavior of Carbon Steel in 55%LiBr Solution Containing Na2MoO4-organophosphorus A Complex Inhibitor

The inhibition effect of Na₂MoO₄-organophosphorus A complex inhibitor on the corrosion of carbon steel in 55%LiBr+0.07 mol/L LiOH solution was studied by weight-loss tests, electrochemical measurements, AFM and EMPA. The results show that Na₂MoO₄-organophosphorus A complex inhibitor performed excellent inhibition in the solution. When its concentration reached 800 mg/L in 55%LiBr+0.07 mol/L LiOH solution at 240 ℃, the corrosion rate of carbon steel decreased to 43.2 μma^-1, the anodic passivation region broadened and the passive current density of carbon steel decreased, the inhibition efficiency was 94.4%. At the same time, the charge transfer resistance increased. The compact compound film formed on the surface of carbon steel in 55% LiBr+0.07 mol/L LiOH solution containing the inhibitor. The film with island structure was mainly composed of iron oxide and molybdenum oxide.