为了提高硅酸盐基陶瓷涂层对金属基体的腐蚀防护性能,在304不锈钢表面制备了4种不同Al含量的硅酸盐基陶瓷涂层(简记为S1—S4)。运用扫描电子显微镜对涂层在3.5% NaCl溶液中浸泡后的微观形貌进行分析,并分别研究了涂层试样腐蚀前后单位面积上的质量变化情况以及涂层的电化学腐蚀行为。结果表明,S3涂层经400h腐蚀液浸泡后基本保持表面平整,相同腐蚀条件下,S3涂层的单位面积质量损失最小,经800℃熔烧,S3涂层能形成较为稳定的钝化区间,表现出最佳的耐腐蚀性能。
In order to improve the corrosion protective performance of silicate-based ceramic coating on metal substrate,four kinds of silicate-based ceramic coatings (denoted as S1—S4) including different Al contents were prepared on the 304 stainless steel surface.The microstructure of coatings after immersion in 3.5% NaCl solution was analyzed by scanning electron microscopy(SEM).The mass change of coating sample before and after corrosion and the electrochemical corrosion behavior were also studied.The results showed that the S3 coating remained basically flat after immersion in the etching solution for 400h.Under the same corrosion condition,the mass loss per unit area of S3 coating was the smallest.After melted at 800℃,S3 coating can form a relatively stable passivation and showed the best corrosion resistance.
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