Microstructure and corrosion behavior of TiC/Ti(CN)/TiN multilayer CVD coatings on high strength steels
Microstructure and corrosion behavior of TiC/Ti(CN)/TiN multilayer CVD coatings on high strength steels
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DOI：
10.1016/j.apsusc.2013.05.037
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发表时间：
2013-09
影响因子：
6.7
通讯作者：
Jin Zhang;Q. Xue;S. Li
中科院分区：
文献类型：
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作者：
Jin Zhang;Q. Xue;S. Li
采用化学气相沉积法在三种高强度钢（35CrMo、42CrMo、40CrNiMo）表面制备碳化钛/碳氮化钛/氮化钛（TiC/Ti(CN)/TiN）多层涂层。分析了多层膜的断口形貌、元素分布、物相组成、显微硬度和附着力。涂层的耐硫化氢应力腐蚀能力通过美国腐蚀工程师协会饱和硫化氢溶液浸泡试验来评价。还进行了模拟四川罗家寨天然气井高温高压环境的试验。结果表明，多层涂层结构致密，厚度约11μm，纳米硬度为24.5±2.0GPa，附着力约70N。腐蚀样品还显示出在用涂层处理后没有由应力腐蚀引起的脆性破坏。重量分析表明，与高强度钢基体相比，TiC/Ti(CN)/TiN多层涂层的沉积导致腐蚀速率降低至少50倍。对此现象进行了初步分析。
Titanium carbide/titanium carbonitride/titanium nitride (TiC/Ti(CN)/TiN) multilayer coatings are prepared on the surface of three high-strength steels (35CrMo, 42CrMo, and 40CrNiMo) by chemical vapor deposition method. The fracture morphology, elemental distribution, phase composition, micro-hardness, and adhesion of the multilayer film are analyzed. The hydrogen sulfide stress corrosion resistance of the coating is evaluated by the National Association of Corrosion Engineers saturated hydrogen sulfide solution immersion test. A test simulating the environment of the natural gas wells with high temperature and pressure in Luojiazhai in Sichuan is also performed. The results show that the multilayer coatings have dense structures, ∼11μm thickness, 24.5±2.0GPa nano-hardness, and ∼70N adhesion. The corrosion sample also shows no brittle failure induced by stress corrosion after treatment with the coating. Gravimetric analysis shows that the deposition of TiC/Ti(CN)/TiN multilayer coatings results in a corrosion rate reduction of at least 50 times compared with the high-strength steel substrate. A preliminary analysis on this phenomenon is conducted.