缓蚀剂在304不锈钢裸表面上的作用机制

研究了重铬酸钾在３０４不锈钢裸表面上的作用机制。实验结果表明，在３．５％的ＮａＣｌ溶液中加入１％Ｋ２Ｃｒ２Ｏ７后，３０４不锈钢的最大溶解早流（ｉｍａｘ）下降；最小溶解电流（ｉｍｉｎ）随电位变化规律发生改变；最大溶解电流、最小溶解电流与电位间的关系曲线向电位变正的方向移动。此外，３０４不锈钢表面膜的修复（再钝化）时间（ｔ）缩短。     

可抑制不锈钢酸洗应力腐蚀的缓蚀剂

采用慢应变法对试样进行拉伸，并结合扫描电镜观察断口形貌，结果表明苯并咪唑类化合物（ＢＭＡＴ）对３１６Ｌ，２Ｃｒ１３等不锈钢在５％ＨＣｌ中的应力腐蚀有着良好的抑制作用。     

不锈钢盐酸酸洗缓蚀剂

通过失重法测试了不同浓度的苯并咪唑类化合物（ＢＭＡＴ）在５％ＨＣｌ中对３１６Ｌ．不锈钢的缓蚀率，探讨其吸附规律符合Ｆｒｕｍｋｉｎ吸附等温式．通过温度对腐蚀率的影响计算表观活化能与吸附热，推断缓蚀机理为化学吸附．极化曲线测试表明．缓蚀剂属阴极为主的阴阳极混合型．     

缓蚀剂BMAT对不锈钢在5%盐酸中（含Fe^3＋）的缓蚀作用

用失重法及通过测定极化曲线，研究了５％ＨＣｌ中Ｆｅ＾３＋腐蚀的影响。结果表明，Ｆｅ＾３＋能改变不锈钢的阴极反应过程，当其含量超过１．５ｍｍｏｌ／Ｌ后，３１６Ｌ的腐蚀速度随着Ｆｅ＾３＋浓度的增大而增大。溶液中加入ＢＭＡＴ后，对Ｆｅ＾３＋的去有化过程有明显的抑制作用，且缓蚀剂的用量需根据Ｆｅ＾３＋的浓度来调整，ＢＭＡＴ的使用量为３ｍｍｏｌ／Ｌ时，酸洗液中Ｆｅ＾３＋的浓度应小于１．５ｍｍｏｌ／Ｌ。     

缓蚀剂在锅炉防腐中的应用

近几十年来,世界上以安全和节能为发展战略的锅炉水处理技术取得了长足进步,许多重大研究开发成果已转化成一系列技术标准和法规,如《火力发电厂水处理设计规程》《低压锅炉水质标准》等等,其中腐蚀的控制是关系到锅炉安全运行的重要环节。本文从锅炉腐蚀特点和现状出发,着重介绍了缓蚀剂在锅炉防腐中的应用。     

不锈钢表面处理应用技术简介(Ⅱ)

4　不锈钢着色4.1　化学着色奥氏体镍铬钢 1Ｃｒ18Ｎｉ8Ｔｉ可着彩色 ,而铁素体和马氏体不适合着彩色。4 .1.1　工艺流程零件→抛光 (机械抛光、化学抛光和电解抛光 )→清洗→酸洗(10 %硫酸、10 %盐酸、室温时间 5～ 10ｍｉｎ ,只用于机械抛光 )→清洗→着彩色→清洗→固膜→清洗→干燥。4 .1.2　着色铬酐 2 5 0 (2 0 0～ 4 0 0 )ｇ/Ｌ ,硫酸 4 90 (35 0～ 70 0 )ｇ/Ｌ ,温度 70～90℃ ,处理时间不同依次出现蓝色→蓝灰色→黄色→紫色→绿色。影响着色膜的因素有 :(1)材料成分　以 18 8型镍铬奥氏体不锈钢着色最鲜艳 ,其他品种则较差 ;(2 )…     

不锈钢表面处理应用技术简介（Ⅰ）

从实用技术方面综合介绍了不锈钢表面处理的有关应用技术，诸如不锈钢酸洗，化学与电解抛光、电镀，着色及腐蚀制版等方面。     

不锈钢表面处理应用技术简介(I)

从实用技术方面综合介绍了不锈钢表面处理的有关应用技术,诸如不锈钢酸洗、化学与电解抛光、电镀、着色及腐蚀制版等方面.     

适用于多种不锈钢和碳钢的盐酸酸洗缓蚀剂

运用失重法评定苯并咪唑类化合物（ＢＭＡＴ）在５％ＨＣｌ中对３１６Ｌ、１８－８、１Ｃｒ１３、２Ｃｒ１３和２０碳钢的缓蚀性能。结果表明，ＢＭＡＴ可广泛应用于抑制多种不锈钢和碳钢的腐蚀。通过对ＢＭＡＴ加入浓度与缓蚀率关系的研究，找到了其在３１６Ｌ、１８－８、２Ｃｒ１３上的吸附等温式；通过温度对缓蚀率影响的研究。计算出三者溶解表观活能及ＢＭＡＴ在不锈上的吸附热效应，从而揭示了ＢＭＡＴ在不锈钢上的吸附机理。     

Influence of Surface Treatment on the Corrosion Resistance of Stainless Steel in Simulated Human Body Environment

In the present research,the influence of chromium enrichment by surface treatment on corrosion resistance of type 316L stainless steel in body environment was investigated.For this study,weight loss test during 18 months,cyclic and liner polarization tests before and after surface treatment and metallography by electron and light microscopy were used to evaluate the effectiveness of the proposed method.In addition,X-ray photoelectron spectroscopy(XPS)method was used to determine the chromium concentration i...     

Metal Surface Treatment and Reduction in Pitting Corrosion of 304L Stainless Steel by Excimer Laser

Abstract

The use of excimer lasers to produce thin rapidly quenched melts on metal surfaces is discussed. Results obtained using a XeCl laser on a variety of metal samples are given. The surface refinement and smoothing induced by laser treatment, giving improved resistance to pitting corrosion and higher etch resistance suggest significant potential for this method as a means of ‘micro-engineering’ surfaces.     

不锈钢表面电沉积耐腐蚀膜层的研究进展

不锈钢因其优异的耐蚀性、导电导热性和机械加工性能而广泛应用于众多领域.为避免不锈钢在使用过程中的腐蚀破坏,在基体表面制备耐腐蚀膜层是主要的防护措施.首先结合近年来不锈钢表面电沉积法制备耐腐蚀膜层的研究现状,对不锈钢表面单层耐腐蚀膜、多层耐腐蚀膜及含掺杂物改性复合膜3种膜层的研究进展进行了概述;在此基础上,从膜层对基体的...     

316L不锈钢表面纳米化后腐蚀性能研究

对表面纳米化和未经表面纳米化处理的316L不锈钢的样品分别进行点蚀实验和应力腐蚀对比实验,在3.5%(质量分数)NaCl水溶液中分别测出它们的极化曲线.结果表明,316L不锈钢表面纳米化后抗点蚀性能下降,抗应力腐蚀性能提高.对应力腐蚀断口的SEM 分析发现,316L不锈钢应力腐蚀断口有明显分区现象,断裂形式为韧性断裂,开裂通道既有穿晶型也有沿晶型.     

Effect of Surface Treatment and Metallic Coating on Corrosion Behavior and Biocompatibility of Surgical 316L Stainless Steel Implant

Surface engineering technology is a suitable method for coatings on the metal surfaces or performing surface modification treatment,which can improve corrosion resistance and biocompatibility of metals.In this research,corrosion behavior of Nb coating on H 2 SO 4 and HNO 3 treated AISI stainless steel 316L (SS) was evaluated.Nb coating was carried out using physical vapor deposition process on the SS.Characterization techniques including scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) technique were used to investigate the microstructure and morphology of the coated and treated SS.Electrochemical potentiodynamic tests were performed in two types of physiological solutions and compared with the pristine SS specimens.Cyclic polarization tests were performed to evaluate resistivity against pitting.Experimental results indicate that Nb coating and surface treatment of the SS had a positive effect on improvement of corrosion behavior.The decrease in corrosion current densities was significant for coated and treated specimens.The corrosion current density was much lower than the values obtained for pristine specimens.     

高铬镍不锈钢的腐蚀电化学特性

高铬镍不锈钢是湿法磷酸工艺装备中常用的材料,该工艺介质中含有磷矿石、Ｈ２ＳＯ４、Ｃｌ＾－和Ｆ＾－等,工作温度８０℃左右。该材料在这类介质中具有良好的耐腐蚀性能,主要源于铬和镍的适当配合。本文就高铬镍不锈钢中铬、镍含量对腐蚀电化学特性的影响进行研究,结果表明,随着铬含量增加,合金更容易钝化;随镍含量提高,合金态越稳定;高铬镍含量有利于合金钝化膜的形成。     

表面纳米化对316L不锈钢抗点蚀性能的影响

分别对未表面纳米化、表面纳米化和表面纳米化后退火处理的316L不锈钢的样品进行点蚀试验,在3.5%NaCl水溶液中分别测出它们的极化曲线.结果表明,316L不锈钢表面纳米化后抗点蚀性能下降;表面纳米化后经退火处理的316L不锈钢随退火温度的升高和退火时间的延长抗点蚀性能会重新恢复.     

New Naturally Occurring Product Extract as Corrosion Inhibitor for 316 Stainless Steel in 5% HCl

Medipolymorphol, a new sterol isolated from the whole plant of Medicago polymorpha Roxb was used as corrosion inhibitor for 316 stainless steel in 5% HCI at room temperature. Electrochemical techniques have been found to be reliable in evaluating corrosion characteristics of the system. Several techniques have been used including Tafel, linear polarization, potentiodynamic polarization, and open circuit potential (OCP) studies. The additives simultaneously deaccelerated the anodic process, intensified the cathodic process and provided a stable passive state, giving good inhibition efficiencies to stainless steel electrodes. In addition, adsorption isotherm have been fitted for the inhibitor under investigation.     

固溶处理对2205双相不锈钢耐蚀性能的影响

利用箱式电阻炉、金相显微镜、电化学工作站等设备研究固溶处理温度对2205不锈钢在不同介质中显微组织和耐蚀性的影响。结果表明,随着固溶温度升高,奥氏体含量不断减少,铁素体含量不断增多;在p H值不同的溶液中,双相不锈钢的耐蚀性能有一定差异:酸性溶液中,在1 050℃左右进行固溶处理,此时的双相不锈钢奥氏体与铁素体含量比接近1∶1,耐酸性能较好,而在碱性溶液中,1 100℃固溶处理时的腐蚀速度较小,耐蚀性能较好;1 100℃固溶处理的双相不锈钢在含氯离子的环境中虽无明显钝化区,但腐蚀速率较小,具有一定耐点蚀性能。