铬锰不锈钢在酸性食物模拟环境中的腐蚀行为研究

发布时间：2018-01-03 07:41

本文关键词：铬锰不锈钢在酸性食物模拟环境中的腐蚀行为研究　出处：《上海大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,铬镍型不锈钢(SS)厨具由于美观、易清洁等优势,受到消费者的亲睐。在我国镍资源相对缺乏的大背景下,以锰代镍的不锈钢得到快速发展,然而降低镍含量会在一定程度上影响不锈钢的耐蚀性,使其在食物环境中可能溶出过量金属元素而影响人们的身体健康。因此,阐明铬锰型不锈钢在食物环境中的腐蚀与元素溶出行为具有重要的理论和实际意义。本论文以沸腾的4 vol%醋酸溶液模拟酸性食物环境,运用电化学测试技术与ICP-AES、SEM、XPS等方法研究了铬锰型不锈钢的腐蚀行为,并探讨了Cl-、温度、粗糙度和合金元素对其腐蚀行为的影响。研究了Cl-对BN4不锈钢的腐蚀和元素溶出行为的影响,结果表明BN4不锈钢在稀醋酸和含Cl-的稀醋酸溶液中均能够钝化,但Cl-会促进钝化膜的腐蚀溶解过程。两种溶液中金属元素的稳定溶出速率顺序为:FeMnCrNi,Fe和Mn元素的优先溶解促使Cr在表面钝化膜中富集,钝化膜主要由铬的氧化物和氢氧化物组成。Cl-会促进Fe和Mn元素的腐蚀溶出,但对Cr和Ni溶出的影响较小。研究了温度和粗糙度对BN4不锈钢在酸性食物模拟环境中的腐蚀行为的影响。结果表明,温度升高,不锈钢腐蚀电位下降,维钝电流密度升高,点蚀电位呈线性下降趋势,升高温度对腐蚀的阳极溶解过程有促进作用。不锈钢表面粗糙度增加,钝化膜的极化电阻值降低,缺陷浓度增加,钝化膜的保护性能下降;同时,点蚀电位下降,维钝电流密度升高,不锈钢的耐蚀性降低。研究了合金元素对不锈钢在酸性食物模拟环境中的腐蚀行为的影响。结果表明,BN1、BN4和304三种不锈钢在沸腾酸性食物腐蚀环境中均可发生钝化而维持较低的腐蚀速率。在13 h浸泡时间内,三种钢腐蚀的极化电阻随时间的延长而不断增大,腐蚀阻力的大小顺序为:304 SSBN4BN1。三种不锈钢中金属元素的1 h初始溶出量和13 h总溶出量的大小顺序均为:FeMnCrNi;Fe、Mn和Cr的初始和总溶出量大小顺序均为:BN1BN4304 SS,Ni的初始和总溶出量大小顺序为:304 SSBN4BN1。BN1不锈钢中Mn含量较高,Cr、Ni含量较低,极化电阻值较小,钝化膜的保护性能较弱,导致Fe、Mn和Cr元素溶出量相对较大。三种不锈钢的Ni溶出速率均较低,Ni含量较高的钢,其Ni溶出量相对较多。
[Abstract]:In recent years, chromium nickel stainless steel kitchenware (SS) due to appearance, easy cleaning and other advantages, by consumers. In the background of the relative lack of nickel resources in China, replaced nickel with manganese steel has been rapid development, but reduce the nickel content will affect the corrosion resistance of stainless steel in a certain extent, the the food in the environment of dissolution and excessive metal elements affect people's health. Therefore, corrosion and clarify elements chromium manganese stainless steel in the food environment the dissolution behavior has important theoretical and practical significance. In this paper, boiling 4 vol% acetic acid solution simulated acidic food environment, using electrochemical testing technology and ICP-AES. SEM, XPS and other methods to study the corrosion behavior of Cr Mn stainless steel, and discusses the influence of Cl-, temperature, roughness and alloy elements on the corrosion behavior of Cl-. Corrosion of BN4 stainless steel and element dissolution behavior The influence of the results showed that BN4 stainless steel can passivate in dilute acetic acid solution and dilute acetic acid containing Cl-, but the Cl- will promote the process of passivation film. The corrosion dissolution rate of sequential dissolution of two kinds of metal elements in the solution stability: FeMnCrNi, preferential dissolution of Fe and Mn elements to Cr enrichment in surface passivation film in the passive film is mainly composed of oxides and hydroxides of chromium.Cl- will promote corrosion of Fe and Mn elements of the dissolution, but has little effect on Cr and Ni dissolution. The effects of temperature and roughness on the corrosion behavior of BN4 stainless steel in simulated environment acidic food effect. The results show that the temperature, corrosion of stainless steel potential, passive current density increased, the pitting potential decreases linearly increased, the anodic dissolution temperature on Corrosion of stainless steel surface roughness increases, the polarization resistance of passivation film decreased, defect concentration increased Plus, fall protection performance of passivation film; at the same time, the pitting potential decreased, passive current density increased, the corrosion resistance of stainless steel decreased. The effects of alloy elements on the corrosion behavior of stainless steel in simulated environment in acidic foods. The results showed that BN1, BN4 and 304 of three kinds of stainless steel in acidic corrosion can be boiling food in the environment of passivation while maintaining low corrosion rate. In 13 h soaking time prolonged, three kinds of steel corrosion polarization resistance increases with time increasing, the corrosion resistance of the order of 13 h total amount and the amount of dissolved the order was dissolved in 1 h 304 SSBN4BN1. three initial metal elements stainless steel in FeMnCrNi: Fe, Mn and Cr; the initial and total dissolution order are: BN1BN4304 SS, Ni of the initial and total dissolution of the order of high content of Mn 304 in SSBN4BN1.BN1 stainless steel Cr, Ni content is low, the polarization resistance value is The smaller the passivation film's protective performance is, the greater the dissolution rate of Fe, Mn and Cr. The dissolution rate of Ni from three stainless steels is low, and the Ni content of the steel with high Ni content is relatively large.

【学位授予单位】：上海大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG142.71

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