共查询到19条相似文献,搜索用时 62 毫秒
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不锈钢钝化工艺的选择 总被引:2,自引:0,他引:2
1 前言我国目前外科植入物生产,通常采用不锈钢制作后,表面经机械抛光、电解抛光、化学钝化后基本上完成了产品的生产过程。由于我国医疗器械生产起步较晚,许多工艺还不完善,特别是钝化工艺,行业内差距很大。为此,我们对外科植入物不锈钢产品的钝化条件进行了实验探索,并得出一些实用性结果,在本文中予以介绍。2 实验2.1 钝化液的选择目前,医疗器械行业采用的化学钝化液分为两大类:一类为硝酸水溶液。另一类为硝酸和重铬酸钾的水溶液。这两类钝化液在其它种类钢的钝化中效果有很大的差异,但是在外科植入物不锈钢产品的钝… 相似文献
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任河山 《中国洗涤用品工业》2015,(1)
不锈钢具有良好的耐腐蚀性能,广泛应用于食品饮料企业。不锈钢的耐腐蚀主要依靠表面钝化膜,如果钝化膜不完整或有缺陷,不锈钢仍会被腐蚀。在设备加工完毕后,通常进行钝化处理,使不锈钢的耐蚀潜力发挥得更大。本文根据有关生产实践,概述不锈钢的钝化工艺。 相似文献
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针对0Cr13Ni8Mo2Al不锈钢试验件,研究了不同的切削加工表面质量和钝化工艺对于钝化膜表面形貌结构、化学组成和耐腐蚀性能的影响.表面粗糙时钝化膜表面凹凸不平、犁沟较深、并存在微裂纹,较深的犁沟含有较高的P、S元素,是钝化膜易发生腐蚀的薄弱区.对不同温度制备的钝化膜进行电化学测试和盐水浸泡测试,结果表明,合适的表面... 相似文献
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采用四因素三水平L9(34)正交试验方法研发了适用于马氏体不锈钢手术器械的柠檬酸系基础钝化工艺,并进一步实验选取了螯合剂的最佳配方,采用压力蒸汽试验、氯化钠溶液试验测试评估了马氏体不锈钢手术器械钝化膜的耐蚀性。结果表明,优选出的钝化溶液配方和工艺为:20%柠檬酸、2%氧化剂、2%螯合剂,θ为45℃,钝化t为38 min。此工艺配方可满足马氏体不锈钢手术器械耐腐蚀性能要求,作为优选的清洁生产工艺可替代污染严重的硝酸钝化工艺。 相似文献
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谈谈不锈钢硝酸钝化法 总被引:2,自引:0,他引:2
由于追求"厚膜"的不锈钢钝化工艺,在实际生产过程中.其导致的氧化反应会最终造成部件表面的色泽有变化,而产生重现性不佳之后果,于是有的厂家走了回头路,还是采用传统的硝酸钝化法工艺。对此,该怎么看待?笔者认为,一些不锈钢钝化的新工艺,其实施关键是要控制得当,即追求膜层厚度与追求色泽不变要有机地统一起来,不可偏废哪一方。由于不锈钢表面的氧化膜层加厚到一定程度,就会有颜色产生,我们就应当在未显出颜色时就将部件从溶液中取出。难度是有的,但这总归要比控制彩色不锈钢之色泽变化容易得多吧,因此还是要努力探索产生厚… 相似文献
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简要地论述了不锈钢在不同浓度的硝酸及氢氟酸溶液中的腐蚀及缓蚀剂。喹啉衍生物在硝酸溶液中 ,某些含氮、含硫的有机化合物及炔系衍生物在氢氟酸溶液中 ,可作为不锈钢的有效缓蚀剂 相似文献
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不锈钢设备及零部件酸洗钝化技术 总被引:4,自引:3,他引:4
不锈钢在石油化工行业中应用十分广泛,而接触腐蚀装置介质的设备必须进行酸洗钝化处理。概括了不锈钢酸洗钝化处理的原理、方法、工艺与应用范围,以及注意事项。 相似文献
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奥氏体不锈钢设备的化学清洗和钝化 总被引:1,自引:0,他引:1
从奥氏体不锈钢的钝化机理入手,分析了钝化膜存在的意义、破坏机理和防护措施,给出了参考的清洗钝化剂配方、清洗钝化工艺、操作注意事项,明确了奥氏体不锈钢钝化膜质量的检验方法。 相似文献
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Effect of alternating voltage passivation on the corrosion resistance of duplex stainless steel 总被引:2,自引:0,他引:2
Huan He Tao Zhang Chengzhi Zhao Kai Hou Guozhe Meng Yawei Shao Fuhui Wang 《Journal of Applied Electrochemistry》2009,39(5):737-745
Potentiodynamic polarization and E
corr versus t curves were obtained, together with electrochemical impedance spectroscopy (EIS) measurements, in order to understand the
effects of alternating voltage (AV) passivation on the corrosion resistance of duplex stainless steel (DSS). SEM, EDS and
XPS were employed to further investigate the influence of AV passivation on the properties of the passive film. The results
of the electrochemical measurements showed that AV passivation significantly improved the corrosion resistance of DSS. SEM
images indicated that the surface exhibited a unique morphology after AV passivation treatment, and XPS results suggested
that AV passivation greatly increased the thickness of the passive film. Furthermore, significant chromium enrichment and
a higher ratio of Fe3+/Fe2+ were observed in the passive film after AV passivation. Mott–Schottky results confirmed that AV passivation had a strong
influence on the semiconducting properties of the passive film. 相似文献
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The passivity and passivity breakdown of 304 stainless steel were investigated in 0.25 M Na2SO4solutions of pH 10. The effect of applied potential and the presence of Cl– ions in the electrolyte were also studied. Different electrochemical methods such as open circuit potential measurements, polarization techniques and electrochemical impedance spectroscopy (EIS) were used. The results showed that the steel electrode passivates under open circuit conditions and also under potentiostatic control. The rate of passive film thickening under open circuit conditions follows a simple logarithmic law. Addition of Cl– ion shifts the polarization curves in the active direction and above a critical chloride concentration, [Cl– ] 0.15 M, pitting corrosion occurs and the pitting potential, E
pit, decreases linearly with the logarithm of [Cl–]. The addition of sulphate ions to the chloride-containing solutions was found to inhibit the pitting process, and at [SO2-
4] 0.25 M, a complete immunity to pitting corrosion was recorded. The impedance measurements provided support for film thickening and film breakdown reactions. An equivalent circuit model which consists of a pure resistor, R
, in series with a parallel combination of a pure resistor, R
p, and a constant phase element, Q, was proposed to describe the electrode/electrolyte interface. The passive film thickness was found to increase with applied potential up to a critical value of 0.3 V. At higher voltages, breakdown of the passive film occured. 相似文献
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介绍了一种201、304不锈钢通用发黑工艺.研究了着色液各组分和挂具的材质对黑色膜性能的影响.着色的最佳配方与工艺为:CrO3 165g/L,H2SO4310mL/L,H3PO4 60mL/L,添加剂A(铵盐)60g/L,添加剂B(过渡金属元素的硫酸盐)143g/L,着色温度91~95℃,着色时间20~25 min,以304不锈钢丝作挂具.在最佳配方与工艺条件下,201、304不锈钢黑板的膜层均匀、黑亮,耐蚀性能均优于对应的基体,耐磨擦性能优越. 相似文献
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针对含少量杂质的稀硫酸在高温环境下的强腐蚀性,选了ND、2205、17-4PH和316L等不锈钢材料,在5%NaCl溶液和现场提取的工作介质中进行了60~80°C工作温度下的腐蚀性试验。结果表明,在5%NaCl溶液中,ND不锈钢耐蚀性能最好;在工作介质中,17-4PH不锈钢的耐蚀性最好。 相似文献
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