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首页> 外文期刊>Journal of Materials Engineering and Performance >Corrosion and Erosion-Corrosion Processes of Metal-Matrix Composites in Slurry Conditions
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Corrosion and Erosion-Corrosion Processes of Metal-Matrix Composites in Slurry Conditions

机译：浆液条件下金属基复合材料的腐蚀与冲蚀腐蚀过程

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摘要

The corrosion and erosion-corrosion (EC) processes of four metal-matrix composites (MMCs) in a simulated cooling water environment have been assessed in this article. The MMCs consisted of two Ni-base and two Fe-base matrices alloyed with different concentrations of chromium, molybdenum, boron, silicon, and carbon; the matrices were reinforced with tungsten carbide (WC) particles. The corrosion behavior has been investigated using a combination of potentiostatic polarization and post-tests surface analysis. The EC processes were studied by in situ electrochemical techniques measuring the current density and corrosion potential response at different slurry temperatures and sand content. At static conditions it was found that as the temperature increased, there was a transition from a homogeneous corrosion of the matrix to an interfacial corrosion mechanism. The Ni-base MMCs showed a better corrosion resistance and interestingly a highly alloyed matrix did not significantly improved MMC's corrosion resistance. In the in situ EC tests, the Fe-base MMCs showed a constant increase in the current density at all sand contents. Whereas, significant changes were not observed in the Ni-base MMCs below 0.5 g/L. Although sand content had an effect on the monitored current density (the current increased as the sand content increased) this effect was less pronounced above 3 g/L.
机译：本文评估了四种金属基复合材料（MMC）在模拟冷却水环境中的腐蚀和侵蚀腐蚀（EC）过程。 MMC由两种镍基和两种铁基基体组成，这些基体合金化了不同浓度的铬，钼，硼，硅和碳。基质用碳化钨（WC）颗粒增强。已经使用恒电位极化和测试后的表面分析相结合的方法研究了腐蚀行为。通过原位电化学技术研究了EC工艺，该技术在不同的浆料温度和含砂量下测量了电流密度和腐蚀电位响应。已发现在静态条件下，随着温度的升高，从基体的均匀腐蚀过渡到界面腐蚀机理。镍基MMC表现出更好的耐腐蚀性，有趣的是，高度合金化的基体并没有显着提高MMC的耐腐蚀性。在原位EC测试中，铁基MMC在所有含沙量下均显示出电流密度的恒定增加。而在低于0.5 g / L的Ni基MMC中未观察到明显变化。尽管含砂量会影响所监测的电流密度（电流随含砂量的增加而增加），但在3 g / L以上时这种影响并不明显。

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