不同颗粒致密度WC-10Co-4Cr涂层的耐腐蚀性能

丁坤英; 程涛涛; 王志平

不同颗粒致密度WC-10Co-4Cr涂层的耐腐蚀性能

中国民航大学天津市民用航空器适航与维修重点实验室, 天津 300300

基金项目: 工信部重大专项资助项目(2011zx04014-21);中央高校基本科研费中国民航大学专项资助项目(ZXH2011D002)

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- 收稿日期: 2011-11-17

Corrosion resistance of different particle-density WC-10Co- 4Cr coatings

Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China

摘要

摘要: 在300 M钢表面上,利用超音速火焰喷涂技术将两种不同颗粒致密度的WC-10Co-4Cr粉末制成涂层.利用扫描电镜、X射线衍射仪、显微硬度计分析涂层的微观组织,通过极化试验和浸泡试验分析涂层的耐腐蚀性能.结果表明,高颗粒致密度粉末制备的WC-10Co-4Cr涂层孔隙率为1.52%,是低颗粒致密度粉末制备涂层的1.95倍;在3.5%NaCl溶液中,高颗粒致密度粉末制备涂层的耐蚀性较差,腐蚀电流密度是低颗粒致密度粉末制备涂层的2.67倍.低颗粒致密度粉末制备的涂层孔隙率低,对基体的保护性较好.
- 颗粒致密度 /
- 超音速火焰喷涂 /
- WC-10Co-4Cr涂层 /
- 孔隙率 /
- 耐腐蚀性能
Abstract: Two kinds of WC-10Co-4Cr coatings with different particle-density were deposited on 300M steel by high-velocity oxygen fuel (HVOF) technology. The microstructure and properties of WC-10Co-4Cr coatings were assessed by scanning electron microscope (SEM),X-ray diffraction (XRD) and micro-hardness tester. The corrosion resistance of the two kinds of coatings in a 3.5% NaCl solution was investigated by polarization test and immersion test. The results indicated that the porosity ratio of high particle-density coating was 1.52%,which was 1.95 times as big as that of low particle-density coating. In the NaCl solution,the value of passivation current density of high particle-density coating was 3.2 μA/cm²,which was 2.67 times as big as that of low particle-density coating. Therefore,low particle-density coating exhibited superior corrosion resistance than high particle-density coating due to its less porosity.
- particle-density /
- high-velocity oxygen fuel /
- WC-10Co-4Cr coating /
- porosity ratio /
- corrosion resistance

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不同颗粒致密度WC-10Co-4Cr涂层的耐腐蚀性能

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Corrosion resistance of different particle-density WC-10Co- 4Cr coatings

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