硫酸泵用合金耐蚀性研究

对九种耐硫酸泵用合金进行均匀腐蚀、晶间腐蚀、点腐蚀实验研究。结果表明，除３１６Ｌ不锈钢外，其余试验钢在特定介质条件下均具有良好的耐蚀性。     

耐稀盐酸泵用材料的研究

本文确定了稀盐酸泵所用材料的化学成分。采用金相显微镜、Ｘ射线衍射和腐蚀试验等方法，研究了新型不锈钢的成分、显微组织与耐蚀性能之间的关系，以及不同的固溶处理温度对耐蚀性能的影响。研究结果表明，该钢经１１５０℃固溶处理，与高合金不锈钢和铸造镍基合金相比，具有较好的耐稀盐酸腐蚀性能。     

耐硫酸及其盐腐蚀的新型双相不锈钢的研究

针对含Ｈ２ＳＯ４１１０．５ｇ／Ｌ、Ｎａ２ＳＯ４３８７ｇ／Ｌ、ＺｎＳＯ４１４．４ｇ／Ｌ，密度为１．３５ｇ／ｃｍ３，温度为６０℃的介质，设计了泵用不锈钢的金相组织和化学成分。其金相组织确定为奥氏体—铁素体双相不锈钢，化学成分为：Ｃ≤０．４％、Ｓｉ４．０％～５．０％、Ｍｎ≤０．８％、Ｐ，Ｓ≤０．０３％、Ｃｒ１９％～２１％、Ｎｉ１９％～２１％、Ｍｏ２．０％～３．０％、Ｃｕ２．０％～３．０％，其余为Ｆｅ。采用金相显微镜和Ｘ射线衍射的方法观察与分析了钢的金相组织，通过试验测定了耐蚀性能，并与性能优良的９０４和ＣＤ４ＭＣｕ钢进行对比。试验结果表明，经１１００℃固溶处理后的新型双相不锈钢（ＫＳ－５）耐蚀性能明显优于对比合金。     

硫酸泵地基腐蚀的防治

化工生产中,输送设备常常接触酸、碱、盐和有机物介质,这些介质均对设备的基础产生不同的化学腐蚀,因而,加强对设备基础防腐蚀是至关重要的。常见的硫酸泵基础,由于防腐蚀处理不当,致使泵座地脚螺栓腐蚀松动,防腐隔离层破坏,硫酸浸蚀基础,造成基础隆鼓开裂,地面腐蚀下沉。直接影响设备的正常使用,给生产带来不安全因素,环境极其恶     

硫磺和硫酸泵的结构材料

1 前言 熔融硫磺和硫酸具有相近的物理性质。在正常的泵送温度下,除了密度之外,二者的性质与水相似。由于密度较大(大于1.8g/cm~3),要获得较高的水力效率就要增加动力,而且必须采用坚固的机械结构。 采用专业的水力和机械设计,选择最好的结构材料,可确保熔硫泵和硫酸泵高效运行并具有较长的使用寿命。     

FS—1硫酸用不锈钢及其应用

根据硫酸的腐蚀特性以及合金设计的基本出发点,力求研究一种在氧化性介质和还原性介质中都能适用的新型不锈钢。分析讨论了ＦＳ－１不锈钢的热处理、组织结构、力学性能、耐腐蚀性能和腐蚀电化学行为。结果表明,ＦＳ－１不锈钢在稀硫酸和浓硫酸中均具优良的耐腐蚀性能,用其制造的稀硫酸泵、ＤＳＢ液下高温浓硫酸泵和搅拌器,经现场试用效果良好．     

09CrCuSb耐硫酸露点腐蚀用钢的焊接实践

09CrCuSb耐硫酸露点腐蚀用钢主要用于耐腐蚀性要求较高的各种恶劣环境,用于抵御含硫烟气的露点腐蚀。介绍了09CrCuSb耐硫酸露点腐蚀用钢的性能及焊接性,通过焊接试验确定了材料的焊接工艺,并成功应用于了生产实践。     

铸铁在硫酸生产中的应用

介绍硫酸对铸铁的腐蚀机理，铸铁的化学组分及硫酸浓度、温度、流速等因素对铸铁耐腐蚀性能的影响。提出几种常用铸铁的理化指标及应用。     

塑料模具材料数据库系统的开发与应用

采用结构化程序和规范化数据库技术开发了塑料模具材料数据库系统,介绍了数据库系统的总体结构、主要模块功能及选材方法。该系统对材料数据信息进行了科学的分类管理,提供了高效的查询方法,实现了对塑料模具材料数据库系统的有效维护。     

路易斯浓硫酸泵在硫酸干吸系统中的应用

介绍美国路易斯浓硫酸泵在400kt／a铜冶炼烟气制酸装置中的应用。在5年的运行过程中，该泵性能良好，但也出现了一些问题，如支撑管腐蚀、轴磨蚀、轴外覆聚四氟乙烯损坏等。对该泵在修理中的几个典型问题进行讨论。     

Noise study of hydrogen evolution process on Cu and Ag microelectrodes in sulphuric acid solution

Recently we reported a method to measure noise and impedance quasi simultaneously. The method was demonstrated in the determination of the symmetry factor of a single electron charge transfer process. In the present work we applied the noise + impedance measurement to a complex electrochemical reaction, namely to the hydrogen evolution process, which, in acidic media is supposed to take place via the Volmer-Heyrovský mechanism. The theory of the noise corresponding to this mechanism has been derived by Tyagai in the early 1970s, however, for the verification no experiments have been published so far. Our investigation was based on the apparent electron number that we calculated from the current noise spectra with certain corrections. We found apparent electron number values between 1 and 2, depending on the electrode material and the applied external current. The results could be rationalized on the basis of Tyagai's theory.     

Electrochemical noise and impedance study of aluminium in weakly acid chloride solution

The electrochemical noise (EN) characteristics of pure aluminium in unbuffered potassium chloride solution and with acetic acid/sodium acetate buffer at pH 5.4 and 4.3 have been analysed to throw light on the influence of pH and of the presence of buffer at the aluminium surface on chloride ion-induced corrosion. Comparison has been made with results obtained by electrochemical impedance spectroscopy (EIS) and quantitative deductions made concerning the values of the noise resistance and the magnitude of the electrochemical impedance. Deviations between results obtained by the two experimental techniques are discussed.     

优化选择氯碱生产设备及管路材料

叙述了氯碱生产设备与管路腐蚀情况,对几种防腐材料性能进行了比较,综合使用情况,提出设备及管路适用材料。     

Evaluation of non-toxic corrosion inhibitors for copper in sulphuric acid

The aim of this paper is to study influence of the molecular structure on the inhibiting properties of organic compounds in corrosion processes in acid media. The inhibiting efficiency of non-toxic imidazole derivatives on copper corrosion in sulphuric acid is investigated. The investigation is performed using electrochemical methods of potentiodynamic polarisation as well as gravimetric measurements. The results of the investigation show that the inhibiting properties of substituted imidazoles depend on molecular structure. The best protection (93%) is obtained by adding a phenyl ring to the imidazole structure. The values of standard free energies of adsorption, as calculated from the Freundlich isotherm, indicate that in the presence of sulphuric acid imidazole derivatives adsorb on copper by a physisorption-based mechanism.     

An electrochemical study of stainless steels and a nickel alloy in a decontamination agent using the potentiodynamic method

Chemical decontamination is accepted as one of the effective methods for decreasing radioactivity from radioactive materials existing in the systems of the nuclear power plants. In chemical decontamination processes, metal oxides dissolve in chelating agents such as oxalic acid and EDTA (Ethylenediaminetetraacetic acid) in the dissolution step for the chemical decontamination process. It is important to investigate corrosion behaviors with respect to decontaminating agents in the development of decontamination process. In this study, the potentiodynamic method was considered among electrochemical methods in order to investigate corrosion behaviors of stainless steels (SS 316, SS 304) and a nickel alloy (Inconel 600). The corrosion behaviors observed in the potentiodynamic results agreed with those of corrosion behaviors observed in the weight loss method, showing that the electrochemical study is a very useful method for estimating corrosion behavior.     

磷钼酸在硫酸-醋酸体系中对304不锈钢的缓蚀性能研究

考察了磷钼酸在硫酸一醋酸混酸介质中对304不锈钢的缓蚀性能,对缓蚀机理进行了初步推断。实验结果表明,磷钼酸是一种阳极型缓蚀剂,在ω(H2SO4)=0．5％～1．5％、ω(CH3COOH)=58．0％、ω(HPA)=0．1％～0．2％,温度100～120℃的条件下,腐蚀速度小于0．05mm／a,缓蚀率高迭99．7％。