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采用环境友好的硫酸羟胺为主要促进剂,避免使用强氧化性物质,并以超声处理来改进磷化工艺。通过动电位极化曲线方法研究了超声、促进剂、pH值和磷化时间对磷化膜耐蚀性能的影响。结果表明,超声处理能够细化磷化颗粒,提高其耐蚀性能。pH值和磷化时间显著影响磷化膜的耐蚀性,需保持在较优的范围。采用电化学阻抗谱研究了优化工艺得到的磷化膜在模拟干热岩地热水中的耐蚀性,发现其电荷转移电阻由碳钢的1.44×10~3Ω·cm~2增加到3.39×10~6Ω·cm~2。
The use of environmentally friendly hydroxylamine sulfate as the main accelerator to avoid the use of strong oxidizing substances, and sonication to improve the phosphating process. The effects of ultrasonic, accelerator, pH value and phosphating time on the corrosion resistance of the phosphate coating were studied by potentiodynamic polarization curve. The results show that the ultrasonic treatment can refine the phosphate particles to improve its corrosion resistance. pH and phosphating time significantly affect the corrosion resistance of the phosphate film, to be maintained in the better range. Electrochemical impedance spectroscopy was used to study the corrosion resistance of the phosphate coating obtained from the optimization process in simulating geothermal water of dry-hot rock. The results show that the charge transfer resistance increases from 1.44 × 10 ~ 3Ω · cm ~ 2 to 3.39 × 10 ~ 6Ω · cm ~ 2.