| 4Cr9Si2船用柴油机排气阀抗热腐蚀性能 |
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| 引用本文： | 王乃凡,许文.4Cr9Si2船用柴油机排气阀抗热腐蚀性能[J].大连海事大学学报(自然科学版),2006,32(2):137-139. |
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| 作者姓名： | 王乃凡 许文 |
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| 作者单位： | 大连海事大学轮机工程学院 辽宁大连116026(王乃凡)，鞍钢金属结构总公司 辽宁鞍山114034(许文) |
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| 摘 要： | 为了解船用柴油机排气阀材料4Cr9Si2的抗热腐蚀性能,用金相显微镜、电子探针和能谱对其腐蚀进行分析.结果表明,4Cr9Si2在500~800℃的抗热腐蚀性能低于1Cr18Ni9,合金中足够的铬含量可以在腐蚀孕育期使合金表面形成致密连续的保护性氧化膜,从而改善合金的热腐蚀性能.镍可以在热腐蚀的加速扩展期起固定硫的作用,从而减缓、延迟了硫向合金基体内的扩散,提高合金的热腐蚀抗力.
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| 关 键 词： | 船用柴油机 金属材料 排气阀 热腐蚀性能 |
| 文章编号： | 1006-7736（2006）02-0137-03 |
| 收稿时间： | 2005-11-19 |
| 修稿时间： | 2005年11月19 |
Study on corrosion at high temperature of valve spindle used in using to ship diesel engine |
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| WANG Nai-fan,XU Wen.Study on corrosion at high temperature of valve spindle used in using to ship diesel engine[J].Journal of Dalian Maritime University,2006,32(2):137-139. |
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| Authors: | WANG Nai-fan XU Wen |
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| Institution: | 1. Marine Eng. College, Dalian Maritime Univ., Dalian 116026,China; 2. Angang Metal Construction Company,Anshan 114034, China |
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| Abstract: | The corrosion resistance at high temperature of 4Cr_9Si_2 valve spindle used in ship diesel engine has been studied.The corrosion layers was analysed by metallograph,EMA and PES.It was shown that the corrosion resistance at high temperature of 4Cr_9Si_2 was inferior to that of 1Cr_(18)Ni_9.For achieving a adequate corrosion resistance at high temperature sufficient Cr content in alloys was needed to form compact and continuous oxide film Cr_2O_3.The nickel can retard and delay the diffusion of S from surface to inside of matrix,so as to improve the corrosion resistance. |
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| Keywords: | ship diesel engine metal materials exhaust valve corrosion resistance at high temperature |
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