Plasma sprayed Cr3C2-Ni-Cr coating for oxidation protection of 2.25Cr-1Mo steel

被引：23

作者：

Ghosh, D. ^{[1
]}

Mitra, S. K. ^{[2
]}

机构：

[1] CSIR, CMERI, NDT & Met Grp, Durgapur 713209, India

[2] Natl Inst Technol, Met & Mat Engn Dept, Durgapur 713209, India

来源：

SURFACE ENGINEERING | 2015年 / 31卷 / 05期

关键词：

Boiler; Oxidation; Coatings; Steel; CORROSION BEHAVIOR; HOT CORROSION; WEAR; SUPERALLOYS;

D O I：

10.1179/1743294414Y.0000000336

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper investigated the influence of Cr3C2-Ni-Cr coating on high temperature oxidation behaviour of 2.25Cr-1Mo steel. The coating of Cr3C2-NiCr was made by plasma spray coating method. The isothermal corrosion test was carried in air oxidation environment at 973 K for 72 h and the weight change of the specimen during corrosion was measured at different interval. The corrosion rate and reaction kinetics were studied and the post corroded scales were characterised in SEM, EDS and XRD. The results clearly indicated that Cr3C2-NiCr coated specimen significantly improved the oxidation resistance. The improvement of oxidation resistance in presence of coating could be attributed to the formation of protective Cr2O3 layer and changed mechanism of scale growth from outer cation migration to inner anion migration. The detail mechanism of the oxidation behaviour of Cr3C2-NiCr coated and uncoated specimen was discussed in this paper.

引用

页码：342 / 348

页数：7

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