海水中碳钢钨系复合缓蚀剂的研究

通过旋转挂片试验,筛选出了新型的具有良好缓蚀性能的钨系海水处理剂,并通过动电位极化曲线测试初步探讨了该海水处理剂的缓蚀机理.结果表明,在本试验条件下,单一钨酸钠在海水中的临界缓蚀浓度为40 mg/L;复合钨系碳钢缓蚀剂的缓蚀率大于90%.该钨系海水处理剂对阴极、阳极均有抑制作用,但以抑制阳极为主.该海水处理剂高效、低毒,对环境友好.其较合适的浓度配比为:40 mg/L钨酸钠,40mg/L聚天冬氨酸,10 mg/L羟基乙叉二膦酸(HEDP),3 mg/L Zn2 .

Tungstate Species Corrosion Inhibitor for Protection of Carbon Steel in Seawater

A series of rotary coupon - hanging tests was performed to screen a novel tungstate- based inhibitor with good corrosion-inhibition capability for carbon steel in seawater treatment. The optimized formulation of the tungstate - based inhibitor for seawater treatment was established, while its corrosion - inhibition mechanisms were primarily discussed in connection with the measurement of the potentiodynamic polarization curve. It was found that the critical concentration of single tungstate corrosion - inhibition agent in seawater was as much as 40 mg/L under the selected test conditions, and the corrosion-inhibition efficiency of the composite tungstate-based corrosion - inhibition agent for carbon steel in seawater was over 90%. Moreover, the titled inhibitor was effective in inhibiting both the anodic and cathodic processes, with the inhibition for the anodic process to be dominant. Moreover, the newly developed inhibitor had the advantages of high efficiency, low toxicity, and environmental acceptance. The optimized formulation for the newly developed inhibitor was suggested to be composed of 40 mg/L of tungstate, 40 mg/L of polyaspartic acid, 10 mg/L of 1 - hydroxy ethylidene -1,1- diphosphonic acid ( HEDP) ,and 3 mg/L of Zn2+.