A novel spinel coating on cobalt-based Superalloy GH605 via an in-situ oxidation approach

作者：Zhang, Kai; Liu, Jinglei^*; Bao, Binbin; Xu, Hong

来源：Surface and Interface Analysis, 2018, 50(4): 448-456.

DOI：10.1002/sia.6389

• Cr-Mn-O spinel coating
• GH605
• H-2-H2O
• selective oxidation

Cr-Mn-O spinel coating was prepared on the surface of cobalt-based superalloy GH605 via an in-situ oxidation method in H2O-H-2 environment. The composition, morphology, and chemical value state of the oxide spinel coatings were investigated by SEM, EDS, XRD, Raman spectra, and XPS. It indicated that the morphology of coating varied with oxidation temperature, and granular surface appeared when oxidation temperature increased to 1100 degrees C. The formed Cr-Mn-O spinel coating was composed of Cr2O3 and MnCr2O4, and the thickness increased significantly with oxidation temperature. In the coating, Cr element existed in the state of Cr3+ ions and Cr6+ ions, while Mn element only existed in the form of Mn2+ ions.

• 出版日期2018-4
• 单位化学工程联合国家重点实验室; 华东理工大学