The influence of preparation of nano-ZrO2/α-Al2O3 gradient coating on the corrosion resistance of 316L stainless steel substrate

IF 1.9 4区材料科学 Q3 Materials Science

Science and Engineering of Composite Materials Pub Date : 2023-01-01 DOI:10.1515/secm-2022-0185

Lianzhi Zhang, Zhangyong Wu, Ting Wang, Z. Mo

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Abstract

Abstract Generally, 316L stainless steel instrumentation tubes working in a humid environment with a large amount of Cl− all the year round have serious corrosion problems, so the stainless steel substrate should be gradiently coated with nano-ZrO2/α-Al2O3 slurry. In this article, the slender 316L stainless steel tube was first ground by magnetorheological fluid and then coated with the slurry, which can not only increase the contact area between the coating and the substrate but also prevent the generation of new substances that have adversely affected the adhesion of the coating. The properties of the samples were characterized and analyzed; the results showed that the substrate ground by magnetorheological fluid is more favorable for bonding with coating under the grinding conditions that the speed of the tube is 210 rpm, magnetic induction intensity is 40.83 mT, and mass ratio of micron and submicron magnetic particles is 2.3. The coating prepared under the above conditions has uniform thickness, flat surface, and can better inhibit the diffusion of Cr of the substrate to its surface. It can be obtained from corrosion resistance analysis that the coating has the highest self-corrosion potential of −0.016 V and the lowest corrosion current density of 0.491 μA/cm2, which indicate that the coating has the strongest corrosion resistance. According to the composition analysis of the coating, the composition of the corroded coating is similar to that of the coating itself, but accompanied by a small amount of Fe, which indirectly indicates that the coating is relatively compact, the coating is well bonded with the substrate, and the coating can protect the substrate; thus, the service life of 316L stainless steel instrumentation tubes is extended.

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制备纳米zro2 /α-Al2O3梯度涂层对316L不锈钢基体耐腐蚀性能的影响

摘要:316L不锈钢仪表管常年工作在Cl−含量较大的潮湿环境中，腐蚀问题严重，因此应在不锈钢基体上梯度涂覆纳米zro2 /α-Al2O3浆液。本文将细长的316L不锈钢管先用磁流变液研磨，再涂上浆液，既可以增加涂层与基材的接触面积，又可以防止产生对涂层附着力有不利影响的新物质。对样品的性能进行了表征和分析;结果表明:在管材转速为210 rpm、磁感应强度为40.83 mT、微米级和亚微米级磁性颗粒质量比为2.3的磨削条件下，磁流变液研磨的基体更有利于与涂层结合。在上述条件下制备的涂层厚度均匀，表面平整，能较好地抑制基体中Cr向其表面的扩散。耐蚀性分析表明，该涂层的自腐蚀电位最高为- 0.016 V，腐蚀电流密度最低为0.491 μA/cm2，具有较强的耐蚀性。根据对涂层的成分分析，被腐蚀涂层的成分与涂层本身的成分相似，但伴随有少量的铁，这间接表明涂层相对致密，涂层与基体结合良好，涂层能够保护基体;从而延长了316L不锈钢仪表管的使用寿命。

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来源期刊

Science and Engineering of Composite Materials 工程技术-材料科学：复合

CiteScore

3.10

自引率

5.30%

发文量

审稿时长

4 months

期刊介绍： Science and Engineering of Composite Materials is a quarterly publication which provides a forum for discussion of all aspects related to the structure and performance under simulated and actual service conditions of composites. The publication covers a variety of subjects, such as macro and micro and nano structure of materials, their mechanics and nanomechanics, the interphase, physical and chemical aging, fatigue, environmental interactions, and process modeling. The interdisciplinary character of the subject as well as the possible development and use of composites for novel and specific applications receives special attention.