CVD-titanium carbonitride coatings as corrosion-preventing barriers for steel in acid-brine steam at 200°C

被引:17
作者
Sugama, T [1 ]
机构
[1] Brookhaven Natl Lab, Dept Appl Sci, Energy Efficiency & Conservat Div, Upton, NY 11973 USA
关键词
titanium carbonitride coating; acid-brine; chemical vapor deposition;
D O I
10.1016/S0167-577X(98)00163-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Titanium carbonitride [(Ti(CN)] coating was deposited onto steel surfaces by chemical vapor deposition (CVD) technology at a moderate temperature; then, its effectiveness in preventing the corrosion of steel was evaluated in an acid-brine geothermal environment at 200 degrees C under a hydrothermal pressure of 1.45 MPa. Two undesirable attributes caused its failure as a corrosion-preventing coating: one factor was the susceptibility of Ti(CN) to oxidation reactions with aqueous steam, leading to the formation of TiO2 scale. Furthermore, this TiO2 scale then was transformed into water-soluble TiCl4 salt by the attack of acid brine, thereby resulting in its dissolution in the aqueous medium. The corrosion of Ti(CN) in such an environment took place through the precesses of oxidation --> chlorination --> dissolution. The other factor was the inherent defects and pores in the coating layers, allowing the corrosive species to infiltrate easily. In fact, corrosion products from the underlying steel were observed at several different locations in the coating's surfaces. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:227 / 234
页数:8
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