本文關鍵詞：鉻錳不銹鋼在酸性食物模擬環(huán)境中的腐蝕行為研究　出處：《上海大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 鉻錳系不銹鋼 沸騰醋酸溶液 腐蝕 金屬元素溶出 廚具

【摘要】：近年來,鉻鎳型不銹鋼(SS)廚具由于美觀、易清潔等優(yōu)勢,受到消費者的親睞。在我國鎳資源相對缺乏的大背景下,以錳代鎳的不銹鋼得到快速發(fā)展,然而降低鎳含量會在一定程度上影響不銹鋼的耐蝕性,使其在食物環(huán)境中可能溶出過量金屬元素而影響人們的身體健康。因此,闡明鉻錳型不銹鋼在食物環(huán)境中的腐蝕與元素溶出行為具有重要的理論和實際意義。本論文以沸騰的4 vol%醋酸溶液模擬酸性食物環(huán)境,運用電化學測試技術與ICP-AES、SEM、XPS等方法研究了鉻錳型不銹鋼的腐蝕行為,并探討了Cl-、溫度、粗糙度和合金元素對其腐蝕行為的影響。研究了Cl-對BN4不銹鋼的腐蝕和元素溶出行為的影響,結果表明BN4不銹鋼在稀醋酸和含Cl-的稀醋酸溶液中均能夠鈍化,但Cl-會促進鈍化膜的腐蝕溶解過程。兩種溶液中金屬元素的穩(wěn)定溶出速率順序為:FeMnCrNi,Fe和Mn元素的優(yōu)先溶解促使Cr在表面鈍化膜中富集,鈍化膜主要由鉻的氧化物和氫氧化物組成。Cl-會促進Fe和Mn元素的腐蝕溶出,但對Cr和Ni溶出的影響較小。研究了溫度和粗糙度對BN4不銹鋼在酸性食物模擬環(huán)境中的腐蝕行為的影響。結果表明,溫度升高,不銹鋼腐蝕電位下降,維鈍電流密度升高,點蝕電位呈線性下降趨勢,升高溫度對腐蝕的陽極溶解過程有促進作用。不銹鋼表面粗糙度增加,鈍化膜的極化電阻值降低,缺陷濃度增加,鈍化膜的保護性能下降;同時,點蝕電位下降,維鈍電流密度升高,不銹鋼的耐蝕性降低。研究了合金元素對不銹鋼在酸性食物模擬環(huán)境中的腐蝕行為的影響。結果表明,BN1、BN4和304三種不銹鋼在沸騰酸性食物腐蝕環(huán)境中均可發(fā)生鈍化而維持較低的腐蝕速率。在13 h浸泡時間內(nèi),三種鋼腐蝕的極化電阻隨時間的延長而不斷增大,腐蝕阻力的大小順序為:304 SSBN4BN1。三種不銹鋼中金屬元素的1 h初始溶出量和13 h總溶出量的大小順序均為:FeMnCrNi;Fe、Mn和Cr的初始和總溶出量大小順序均為:BN1BN4304 SS,Ni的初始和總溶出量大小順序為:304 SSBN4BN1。BN1不銹鋼中Mn含量較高,Cr、Ni含量較低,極化電阻值較小,鈍化膜的保護性能較弱,導致Fe、Mn和Cr元素溶出量相對較大。三種不銹鋼的Ni溶出速率均較低,Ni含量較高的鋼,其Ni溶出量相對較多。
[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.

【學位授予單位】：上海大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG142.71

【參考文獻】

相關期刊論文 前3條

1 李金波;鄭茂盛;朱杰武;;304L不銹鋼鈍化膜半導體性能研究[J];腐蝕科學與防護技術;2006年05期

2 齊達;李晶;董力;余健;;200系列不銹鋼耐腐蝕性能研究[J];鋼鐵釩鈦;2010年02期

3 孟波;郭萬林;姜燕;;表面形貌對1Cr11Ni2W2MoV不銹鋼耐腐蝕性能的影響[J];機械工程材料;2008年08期

相關碩士學位論文 前2條

1 申鵬;國內(nèi)304不銹鋼熱軋板材耐蝕性能的對比研究[D];蘭州理工大學;2011年

2 賈利;Zn~(2+)對不銹鋼鈍化膜半導體性質(zhì)的影響[D];華北電力大學（河北）;2009年

，

本文編號：1373021