共查询到20条相似文献,搜索用时 125 毫秒
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选取20#钢进行热浸渗铝法渗铝,通过渗铝层检测及腐蚀试验数据分析,得出渗铝管的耐腐蚀性能与渗铝层的原始裂纹等级并无关联,为工程选取渗铝管材料提供试验数据支持。 相似文献
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渗铝钢在小氮肥厂的应用 总被引:1,自引:0,他引:1
由于渗铝钢具有良好的耐热、耐腐(特别是耐高温H_2S的腐蚀)、耐磨与价格低廉等优点,故能取代一些普通无缝钢管和不锈钢管,适应于在小氮肥厂中的应用。本文介绍了渗铝钢的发展及特性;小氮肥厂中部分设备腐蚀原因和渗铝钢的应用;使用情况及效益分析等。 相似文献
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渗铝钢在硫酸装置中的应用 总被引:1,自引:0,他引:1
介绍了渗铝钢的组织结构特点及其机械性能、抗高温氧化和耐腐蚀性能。实践证明,渗铝钢在硫酸装置中的应用是成功的,并且具有良好的推广价值。 相似文献
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采用硝酸亚铈、六偏磷酸钠组成的转化液,在镀锌钢表面制备了铈盐转化膜,研究了硫化钠(Na2S)对其耐蚀改性作用。通过中性盐雾(NSS)试验考察了Na2S质量浓度、pH、温度、时间等工艺条件对转化膜耐蚀性的影响,通过单因素试验得到最佳转化条件为:Na2S 6 g/L,温度25°C,pH 0.8,转化时间3 min。用扫描电镜和能谱分析了有无Na2S改性的铈盐转化膜的形貌结构及成分,用Tafel极化曲线法比较了它们的耐蚀性。结果表明,加入Na2S增强了铈盐转化膜与镀锌钢基体的附着力,提高了O、P、Ce等主要耐蚀成分的含量,耐盐雾腐蚀时间由改性前的24 h延长到改性后的96 h,耐蚀性显著提高。 相似文献
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采用一种新型盐浴对K55石油管线钢进行盐浴渗氮处理,研究了渗层的截面形貌,显微硬度在不同渗层深度上的分布及渗层的耐硫腐蚀性。K55钢经560℃盐浴渗氮处理2h后,表层组织由疏松层、渗氮层及基体扩散层组成。渗层和表面的氧化疏松薄层的厚度分别约为12.48μm和1.54μm,渗层的总深度约为30μm。经渗氮处理的K55钢,其显微硬度明显提高,表面的显微硬度高达695HV,但显微硬度沿渗层深度方向急剧下降。渗氮处理后,K55钢的耐硫腐蚀性能得到明显改善。因此,可利用盐浴渗氮处理来降低油管下井前的腐蚀缺陷。 相似文献
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Weight-loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements were used to study the inhibition of 304 stainless steel corrosion in 1 M H2SO4 at 50 °C by propargyltriphenylphosphonium bromide (PgTPhPBr). The inhibiting effects of propyltriphenylphosphonium bromide (PrTPhPBr) and propargyl alcohol (PA) were also studied for the sake of comparison. For the investigated compounds, Tafel extrapolation in the cathodic region gave a corrosion inhibition efficiency of 98% at 1 × 10–3 M. Adsorption of both PgTPhPBr and PA was found to follow Frumkin's isotherm while adsorption of PrTPhPBr obeys that of Temkin. In the anodic domain, PgTPhPBr acted as a good passivator. The impedance spectra recorded at the corrosion potential (E
cor) revealed that the charge transfer process in the inhibited and uninhibited states controls corrosion of 304 stainless steel. 相似文献
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Nanocrystallization of aluminized surface of carbon steel for enhanced resistances to corrosion and corrosive wear 总被引:1,自引:0,他引:1
Aluminizing is often used to improve steel's resistances to corrosion, oxidation and wear. This article reports our recent attempts to further improve aluminized carbon steel through surface nanocrystallization for higher resistances to corrosion and corrosive wear. The surface nanocrystallization was achieved using a process combining sandblasting and recovery heat treatment. The entire surface modification process includes dipping carbon steel specimens into a molten Al pool to form an Al coat, subsequent diffusion treatment at elevated temperature to form an aluminized layer, sandblasting to generate dislocation network or cells, and recovery treatment to turn the dislocation cells into nano-sized grains. The grain size of the nanocrystallized aluminized surface layer was in the range of 20–100 nm. Electrochemical properties, electron work function (EWF), and corrosive wear of the nanocrystalline alloyed surfaces were investigated. It was demonstrated that the nanocrystalline aluminized surface of carbon steel exhibited improved resistances to corrosion, wear and corrosive wear. The passive film developed on the nanocrystallized aluminized surface was also evaluated in terms of its mechanical properties and adherence to the substrate. 相似文献
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The effects of cold work and sensitization treatment on the microstructure and corrosion resistance of a nickel-free high nitrogen stainless steel (HNSS) in 0.5 M H2SO4 + 0.5 M NaCl, 3.5% NaCl and 0.5 M NaOH + 0.5 M NaCl solutions have been investigated by microscopic observations, electrochemical tests and surface chemical analysis. Cold work introduced a high defect density into the matrix, resulting in a less protective passive film as well as reduced corrosion resistance for heavily cold worked HNSS in a 3.5% NaCl solution. No obvious degradation in corrosion resistance took place in a 0.5 M H2SO4 + 0.5 M NaCl solution, possibly due to the stability of the passive film in this solution. Sensitized HNSSs showed reduced corrosion resistance with increasing cold work level in both 3.5% NaCl and 0.5 M H2SO4 + 0.5 M NaCl solutions due to a reduction in the anti-corrosion elements in the matrix during the cold work-accelerated precipitation process. The cold work and sensitization treatment had no influence on the corrosion resistance of the HNSS in the 0.5 M NaOH + 0.5 M NaCl solution even though the property of the passive film changed. The effects of cold work and sensitization treatment on the characteristics of passive films formed in the three solutions are discussed. 相似文献