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YUANQing-long LIANGHong-da 《钢铁研究学报(英文版)》2004,11(4):52-55
With a rotating cylinder electrode apparatus, the polarization behaviors of the mildsteel and the stainless steel 0Crl8Ni9 in NaHCO3 (0.5M) NazCO3 (0.5M) solution with andwithout erodent particles were investigated and compared. The results show that the rotationspeed of cylinder hardly affects the polarization behavior of sample in solution without particlesbut exerts a great influence on that with particles. Increasing rotation speed, the free corrosionpotential shifts to positive direction and the oxygen limiting current density increases. Both themild steel and stainless steel 0Crl8Ni9 experience a significant increase of the mass loss by in-creasing erosion, and erosive wear was dominated by severe micro-plowing. The insufficientmechanical strength of both materials leads to a low resistance to particle removal. Increasingperipheral velocities of the rotating cylinder enhances the corrosion rate of the mild steel. Thestainless steel 0Crl8Ni9, due to a high erosive wear, also suffers from similar erosion-corrosiondamage, despite that its corrosion resistance is much higher than that of the mild steel. 相似文献
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对自制的一种新型高锰奥氏体耐液锌腐蚀合金在490℃的熔融纯锌液中的腐蚀行为进行了系统的研究,并探讨了其耐液锌腐蚀机理.结果表明,与316L不锈钢相比,新型高锰奥氏体合金具有更好的耐液锌蚀能力,其腐蚀速率为6.42×10-4g·cm-2·h-1,而316L不锈钢的腐蚀速率为1.54×10-3g·cm-2·h-1.新型高锰奥氏体合金在锌液中的最终腐蚀产物为Γ相+δ相+ζ相,而316L不锈钢的腐蚀产物几乎全是ζ相.新型高锰奥氏体合金的腐蚀产物中δ相固溶了质量分数在8.5%左右的Cr,Cr的存在使得δ相稳定性增加,致密的富含Cr的δ相的存在减缓了铁、锌反应速率,提高了新型高锰奥氏体合金的耐液锌腐蚀能力.因此,以锰代镍来制取低成本的新型高锰奥氏体耐液锌腐蚀合金具有可行性. 相似文献
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Girija Suresh T. Nandakumar C. Mallika U. Kamachi Mudali L. Ninova C. Andreev 《Transactions of the Indian Institute of Metals》2014,67(3):367-374
The corrosion behaviour of 304LN stainless steels containing three different nitrogen content (0.132, 0.193, 0.406 wt% N) was investigated by potentiodynamic anodic polarization technique, in 1, 4, 6 M nitric acid and simulated high level waste (HLW) medium. The results showed that all three alloys exhibited good corrosion resistance in nitric acid and simulated HLW and the corrosion properties were found to be similar. Owing to the spontaneous formation of the protective chromium oxide passive film in nitric acid and simulated HLW, increasing the nitrogen content of the alloy did not indicate any discernable effect on the corrosion resistance in both media. It was also found that the oxidizing ions present in simulated HLW did not deteriorate the passive film stability of the nitrogen containing alloys. In chloride medium, the highest nitrogen content 304LN stainless steel showed a profound increase in pitting corrosion resistance when compared to the lower nitrogen content alloy. Optical and scanning electron microscopy was carried out to obtain information about the microstructure. The results of the investigation are discussed in the paper. 相似文献
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激光熔敷Ni60/WC合金层的腐蚀磨损特性 总被引:6,自引:1,他引:5
研究了45钢表面激光熔敷镍基WC合金层的耐蚀性及在不同冲击速度和不同浓度酸性介质下的腐蚀磨损特性。结果表明,激光熔敷Ni60/WC合金层不论耐蚀性还是抗腐蚀磨损性能同于2Cr13不锈钢。应用微机对试验结果进行逐步回归分析,得出了影响因素与腐蚀磨损速度的害量关系,并探讨了熔敷层的腐蚀磨损过程。 相似文献
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铁素体不锈钢中Cr元素对其耐腐蚀性能起着非常重要的作用。本文采用实验室冷凝液腐蚀实验方法,对一系列汽车排气系统用铁素体不锈钢在实验室模拟冷凝液中的腐蚀性能进行了研究。所有钢种经过10周期的实验室冷凝液腐蚀实验后,研究结果表明:Cr当量高于17%的铁素体不锈钢与含17%Cr的铁素体不锈钢耐实验室冷凝液腐蚀性能相当,且平均腐蚀失重量均小于6g/m2,平均最大腐蚀深度均小于0.03mm。在此实验结果的基础上,对新开发的439M型铁素体不锈钢和409L型铁素体不锈钢进一步开展5周期、10周期、20周期的实验室冷凝液腐蚀实验,并使用极值分析方法对三种周期冷凝液腐蚀实验后样品的最大点蚀深度进行统计分析,研究结果表明,新开发的439M型铁素体不锈钢的预测寿命是409L的1.6倍。 相似文献
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研究锰元素对2205双相不锈钢耐点蚀性能的影响, 锰质量分数的变化范围为0. 93%~1. 26%.分别采用化学腐蚀法、动电位极化法研究双相不锈钢2205的耐腐蚀性能, 采用夹杂物自动分析技术研究锰对钢中夹杂物种类及数量的影响, 通过扫描电镜、能谱及夹杂物原位分析法观察化学腐蚀及电化学腐蚀前后钢中夹杂物及其周围钢基体的变化情况.采用电感耦合等离子体发光光谱测定腐蚀产物的成分.研究结果表明, 不同类型的夹杂物对耐腐蚀性能的影响不同, (Mn、Si) 氧化物以及(Mn、Si、Cr) 氧硫化物在腐蚀液中更易溶解进而促进腐蚀, 而(Cr、Mn、Al) 氧化物却很稳定.锰的加入会促进钢中(Cr、Mn、Al) 夹杂的析出, 此类夹杂物不仅自身很容易被含Cl离子的溶液腐蚀, 而且作为点蚀的起始点, 促进了点蚀坑的形成, 加快了基体腐蚀, 最终导致不锈钢耐点蚀性能的下降. 相似文献
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Xiang-hong L Fu-xiang ZHANG Xiang-tong YANG Jun-feng XIE Guo-xian ZHAO Yan XUE 《钢铁研究学报(英文版)》2014,21(8):774-780
High pressure and high temperature corrosion performance of high strength 15 Cr martensitic stainless steel was studied in different severe environments—live acid(10%HCl+1.5%HF+3%HAc+5.1% corrosion inhibitor),spent acid and formation water containing CO2.The results show that the corrosion of high strength 15 Cr martensitic stainless steel in live acid is most serious,and the uniform corrosion rate is far greater than those in spent acid and formation water containing CO2 corrosion environments,but all of them can be acceptable for oilfield.Acidizing corrosion inhibitor displays a good matching ability with the high strength 15 Cr martensitic stainless steel in terms of decreasing the uniform corrosion rate,which changes mainly the anodic process of high strength 15 Cr martensitic stainless steel.The corrosion potential moves to the positive direction,thus the corrosion current density decreases significantly.There are some different degrees of pitting of high strength 15 Cr martensitic stainless steel after corrosion tests in live acid,spent acid and formation water containing CO2,and the pitting density aggravates significantly and the maximum pit depth decreases in the corrosion sequence. 相似文献
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航空用轴承钢向耐高温、耐腐蚀、高承载、长寿命方向发展,现役的M50轴承钢存在强度高但韧性和耐蚀性不足的问题;M50 NiL渗碳轴承钢虽然通过降低碳含量和调整合金成分来提高韧性,但仍越来越无法满足高推重比的航空发动机的发展需求,并且耐蚀性不足问题也未解决。高铬不锈轴承钢BG-42和高氮Cronidur30轴承钢虽然抗腐蚀能力好,但是表面硬度和心部韧性仍不足。以CSS-42L钢为代表的高温不锈渗碳轴承钢拥有高强韧性和优良耐蚀性能,不仅在航空轴承应用上极具竞争优势,而且也可应用于在高温或腐蚀性环境下使用的齿轮、轴和紧固件等,但是国内外相关研究工作仍不足且缺乏系统性,因此对其研发现状进行综述和总结尤为重要。从航空用高温轴承钢发展历程出发,详细介绍了国内外高温不锈渗碳轴承钢的研发背景和合金成分设计思路;综述了铬、钴、钼、镍、钒、钨等主要合金元素对组织和性能影响规律,其中钴的加入虽然不直接参与析出强化,但能够起到抑制δ-铁素体形成和促进弥散析出的特殊作用;分别从表面渗碳和心部材料两个方面,揭示了调控热处理工艺对微观组织和强韧性的影响规律。在此基础上,针对国内外高温不锈渗碳轴承钢基础理论和制造工艺研究的不足,提出了优化合金成分、突破渗碳热处理技术,以及加强不同工况下组织演变、疲劳损伤和破坏机理研究的研发方向。 相似文献