High-temperature oxidation studies of cold-sprayed Ni-20Cr and Ni-50Cr coatings on SAE 213-T22 boiler steel

被引：84
作者：
Bala, Niraj
Singh, Harpreet [1 ]
Prakash, Satya [2 ]
机构：
[1] Baba Banda Singh Bahadur Engn Coll, Dept Mech Engn, Fatehgarh Sahib 140407, Punjab, India
[2] Indian Inst Technol, Roorkee, Uttrakhand, India
来源：
APPLIED SURFACE SCIENCE | 2009年 / 255卷 / 15期
关键词：
High-temperature oxidation; Cold spraying; Ni-20Cr; Ni-50Cr; Oxide scales; Boiler steel; HOT CORROSION; STEAM OXIDATION; 9CR-1MO STEEL; BEHAVIOR; NI; 900-DEGREES-C; RESISTANCE; SALT;
D O I：
10.1016/j.apsusc.2009.03.006
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The high-temperature oxidation behavior of cold-sprayed Ni-20Cr and Ni-50Cr coatings on SAE 213-T22 boiler steel has been investigated at 900 degrees C in air under cyclic heating and cooling conditions for 50 cycles. The kinetics of oxidation of coated and bare boiler steel has been established with the help of weight change measurements. It was observed that all the coated and bare steels obeyed parabolic rate law of oxidation. X-ray diffraction, FE-SEM/EDAX and X-ray mapping techniques were used to analyse the oxidation products of the coated and uncoated boiler steel. The uncoated steel suffered corrosion in the form of intense spalling and peeling of its oxide scale, which was perhaps due to the formation of unprotective Fe2O3 oxide scale. Both the coatings showed better resistance to the air oxidation as compared to the uncoated steel. The Ni-50Cr coating was found to be more protective than the Ni-20Cr-coated steel. The formation of oxides and spinels of nickel and chromium may be contributing to the development of air oxidation resistance in the coatings. (C) 2009 Elsevier B.V. All rights reserved.
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页码：6862 / 6869
页数：8
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