飞机镀镉高强度钢在机场道面除冰剂中的腐蚀行为及机理

发布时间：2018-05-07 10:42

本文选题：镀镉高强度钢 + 腐蚀行为　；参考：《材料保护》2016年07期

【摘要】：目前,对镀镉层在机场道面除水剂中腐蚀行为及机理的研究不多。采用全浸泡腐蚀和循环腐蚀试验方法模拟飞机高强度镀镉钢在接触到机场道面除冰剂后的腐蚀行为,研究了镉镀层在机场道面除冰剂中的腐蚀行为及腐蚀机理。镀镉钢浸泡在AMS 1435机场道面除冰剂中时,初始阶段腐蚀速率很大,随着浸泡时间的增长腐蚀速率逐渐变小,而浸泡在甲酸钠和乙酸钾溶液中时则反之;镀镉钢在同一种机场道面除冰剂中,循环腐蚀时比全浸泡腐蚀时的腐蚀速率大,可能是循环腐蚀测试中镀镉钢浸湿后暴露在空气中导致溶液氧浓度增大引起的。通过对腐蚀产物的能谱分析,试片上残留的腐蚀产物为镉的碳酸盐和少量的磷酸盐,碳酸盐的形成来自机场道面除冰剂中有机酸盐的分解,磷酸盐可能来自机场道面除冰剂中的p H值缓冲剂。镀镉钢在机场道面除冰剂中的腐蚀首先是以镉镀层溶解形成Cd~(2+)开始,然后是机场道面除冰剂分解形成碳酸根,最后形成CdCO_3附着在镉镀层上。通过对飞机镀镉高强度钢腐蚀机理的研究,可为飞机镀镉钢的防腐蚀和机场道面除冰剂的研发提供理论支持。
[Abstract]:At present, there are few studies on the corrosion behavior and mechanism of cadmium coating in airport pavement dewatering agent. The corrosion behavior of aircraft high strength cadmium plated steel after contact with airport deicing agent was simulated by means of full immersion corrosion and cyclic corrosion test. The corrosion behavior and corrosion mechanism of cadmium coating in airport deicing agent were studied. The corrosion rate of cadmium-plated steel in the deicing agent of AMS 1435 airport pavement is very large in the initial stage, and the corrosion rate decreases gradually with the increase of immersion time, while the corrosion rate decreases when immersed in sodium formate and potassium acetate solution. In the same kind of airport deicing agent, the corrosion rate of cadmium plated steel in cyclic corrosion is higher than that in full immersion corrosion, which may be caused by the increase of oxygen concentration in solution after immersion of cadmium plated steel in the air during cyclic corrosion test. According to the energy spectrum analysis of corrosion products, the residual corrosion products are cadmium carbonate and a small amount of phosphate. The formation of carbonate comes from the decomposition of organic acid salts in the airport deicing agent. Phosphate may come from the pH buffer in the deicing agent on the airport pavement. The corrosion of cadmium-plated steel in airport deicing agent begins with the dissolution of cadmium coating to form Cd~(2), then decomposes to form carbonate, and finally forms CdCO_3 attached to cadmium coating. By studying the corrosion mechanism of high strength steel coated with cadmium on aircraft, it can provide theoretical support for the anticorrosion of cadmium plated steel for aircraft and the research and development of deicing agent for airport pavement.
【作者单位】：中国民航局第二研究所;四川理工学院材料腐蚀与防护四川省重点实验室;
【基金】：国家自然科学基金资助项目(U1333103) 中国民航局安全基金资助项目(MHRD20130302)
【分类号】：V252.1

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