胡勇齐,向志东.马氏体不锈钢Cr-N包埋共渗涂层的耐腐蚀性以及应用[J].表面技术,2019,48(6):282-286.
HU Yong-qi,XIANG Zhi-dong.Corrosion Resistance and Application of Martensitic Stainless Steels with an External Cr-N Coating Layer Formed by Pack Cementation Process[J].Surface Technology,2019,48(6):282-286
马氏体不锈钢Cr-N包埋共渗涂层的耐腐蚀性以及应用
Corrosion Resistance and Application of Martensitic Stainless Steels with an External Cr-N Coating Layer Formed by Pack Cementation Process
投稿时间:2018-11-19  修订日期:2019-06-20
DOI:10.16490/j.cnki.issn.1001-3660.2019.06.034
中文关键词:  Cr2N涂层  包渗法  440A马氏体不锈钢  耐蚀性
英文关键词:Cr2N coating  pack cementation process  martensitic stainless steel  corrosion resistance
基金项目:武汉科技大学省部共建耐火材料与冶金国家重点实验室专项资金资助(2018QN11)
作者单位
胡勇齐 武汉科技大学 材料与冶金学院 省部共建耐火材料与冶金国家重点实验室,武汉 430081 
向志东 武汉科技大学 材料与冶金学院 省部共建耐火材料与冶金国家重点实验室,武汉 430081 
AuthorInstitution
HU Yong-qi State Key Laboratory of Refractories and Metallurgy, School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China 
XIANG Zhi-dong State Key Laboratory of Refractories and Metallurgy, School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China 
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中文摘要:
      目的 研究在440A马氏体不锈钢表面沉积Cr2N涂层,以提高其耐腐蚀性的可行性。方法 采用包埋法并在1100 ℃下保温4 h后炉冷,得到表面涂覆Cr2N涂层的马氏体不锈钢。利用SEM、EDS、XRD研究氮铬共渗层的微观组织,利用极化曲线初步评估涂层的耐腐蚀性,分别在室温和60 ℃下的0.5 mol/L H2SO4+2 mg/L F–腐蚀液中进行全浸泡水浴腐蚀实验,进一步评估涂层的耐腐蚀性。结果 在30Cr2N- 2NH4Cl-68Al2O3渗剂中经1100 ℃保温4 h后,可在不锈钢表面形成致密的Cr2N涂层,涂层组织为Cr2N层(约17 μm)和富Cr沉积层(约19 μm)。表面Cr2N涂层光滑且致密,无裂纹和针孔等缺陷。在模拟PEMFC酸性环境的腐蚀液中(0.05 mol/L H2SO4+2 mg/L F–),不锈钢原样、不锈钢涂层样品的自腐蚀电位和自腐蚀电流分别为-0.623 V和3274 μA/cm2、-0.212 V和0.0362 μA/cm2。在水浴腐蚀实验中,不锈钢涂层样品在室温0.5 mol/L H2SO4+2 mg/L F–腐蚀液中经12 000 h腐蚀后仍未失重,而原样则以0.007 g/h的失重速率溶解;不锈钢涂层样品在60 ℃的0.5 mol/L H2SO4+2 mg/L F–腐蚀液中经800 h腐蚀后仍未失重,而不锈钢原样以0.252 g/h的失重速率快速溶解。结论 表面沉积Cr2N涂层的马氏体不锈钢相对于原样其耐腐蚀性能明显 提高。
英文摘要:
      The work aims to study the feasibility of increasing the corrosion resistance of martensitic stainless steel 440A by depositing a Cr2N coating layer. The martensitic stainless steel deposited with Cr2N coatings was obtained at 1100 ℃ after 4 h pack cementation process. The microstructure of the coatings was studied by SEM, EDS and XRD. Corrosion resistance of the coatings was preliminarily assessed by polarization curve and then further evaluated by immersion test in 0.5 mol/L H2SO4+ 2 mg/L F– at 60 ℃. Dense Cr2N coating was obtained at 1100 ℃ for 4 h in a powder pack 30Cr2N-2NH4Cl-68Al2O3. The coating consisted of a top Cr2N layer (≈17 μm) and a rich diffusion layer of Cr (≈19 μm). The top Cr2N coating was smooth, compact and free of cracks and pinhole defects. In the simulated corrosion solution of PEMFC, the self-corrosion potentials of original stainless steel sample and coated stainless steel sample were -0.623 V and 3274 μA/cm2 and -0.212 V and 0.0362 μA/cm2 respectively. In the immersion test, the coated stainless steel sample had no weight loss for 12,000 h at room temperature in 0.5 mol/L H2SO4+2 mg/L F– solution, while the original stainless steel sample dissolved rapidly at weight loss of 0.007 g/h. On the other hand, the coated stainless steel sample had no weight loss for 800 h at 60 ℃ in 0.5 mol/L H2SO4+2 mg/L F– solution, while the original stainless steel sample dissolved at weight loss of 0.252 g/h. Therefore, the corrosion resistance of martensitic stainless steel deposited with Cr2N coating on the surface is obviously improved compared with the original one.
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