Incoloy800合金在300℃ NaOH和ETA溶液中的腐蝕行為
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時(shí)間：2016-02-17
采用動(dòng)電位極化曲線(xiàn)、電化學(xué)阻抗譜(EIS)、SEM, XPS 等分析手段研究了 800 合金在 300 ℃ NaOH 和乙醇胺(ETA)溶液中的腐蝕行為.
Incoloy800合金在300℃ NaOH和ETA溶液中的腐蝕行為CORROSION BEHAVIOR OF ALLOY 800 IN NaOH AND ETA SOLUTIONS?AT 300 ℃?采用動(dòng)電位極化曲線(xiàn)、電化學(xué)阻抗譜(EIS)、SEM, XPS 等分析手段研究了 800 合金在 300 ℃ NaOH 和乙醇胺(ETA)溶液中的腐蝕行為. 結(jié)果表明, ETA 的添加降低合金的腐蝕電流密度, 增大了氧化膜的膜層電阻; 無(wú)論是否添加 ETA, 800 合金均為雙層膜結(jié)構(gòu); 未添加 ETA 時(shí),合金氧化膜外層富 Ni, ETA 添加后氧化膜外層富 Cr. ETA 的添加提高了氧化膜中 Cr 元素的富集程度, 促進(jìn)了鉻氧化物的形成, 增強(qiáng)了 800 合金氧化膜的保護(hù)性.?
Many components in secondary side of pressurized water reactors (PWRs) are made of carbon?steels and low alloy steels. The corrosion products produced by the flow accelerated corrosion (FAC) of these ?components can deposite on the surface of steam generator (SG) tubes and decrease the heat transfer efficiency of?SG tubes. Moreover, the enrichment of foreign ions (e.g. Cl-and Pb2+) occurs with the sedimentation of corrosion?products and causes the local environment degradation, and thus accelerates the failure of SG tubes. In order to?decrease the FAC of carbon steels and low alloy steels, pH controllers are often added to adjust the pH value of?secondary water. The water chemistry environment of secondary side in PWRs has experienced various treatment?techniques, such as phosphate treatment, all volatile treatment (AVT), morpholine (MPH) treatment, ethanolamine?(ETA) treatment, and boric acid treatment. In comparision with AVT, ETA can significantly reduce the?concentration of Fe in the steam-water phase region and water supply system because of its higher alkalinity and?lower molar concentration in feedwater. Due to the high resistance to corrosion and stress corrosion cracking in?high temperature high pressure water, alloy 800 is often used as steam generator tubes in nuclear power plants and?thus becomes ineasingly attractive among researchers. However, few studies focus on the effect of ETA on the?corrosion behavior of alloy 800 in high temperature and?high pressure water. This work mainly aims to?investigate the corrosion behavior of alloy 800 in NaOH?and ETA solutions at 300 ℃ by potentiodynamic?polarization curve, electrochemical impedance spectra (EIS), SEM and XPS. The electrochemical results?demonstrate that the addition of ETA decreases the current density of anodic and cathodic reactions, and increases?the corrosion potential of alloy 800. Besides, ETA addition significantly increases the resistance of inner oxide?layer and makes the oxide film more compact, which increases the film resistance of alloy 800 in high?temperature water. Through the morphology observation and composition analysis, it is found that ETA addition?can promote the formation of Cr-rich layer and increase the ratio of chromium in the oxide films although the?deposition of magnetite is enhanced on the surface of alloy 800. For stainless steels and nickel-based alloys in?high temperature water, the Cr-rich oxide layer can inhibit the diffusion process of O and metal ions, and reduces?the corrosion rates of alloys. Therefore, the corrosion resistance of alloy 800 is enhanced after ETA is added in?high temperature water.?
作為值得信賴(lài)的合作伙伴和高品質(zhì)金屬合金的半成品供應(yīng)商，艾荔艾擁有完善的服務(wù)體系和專(zhuān)業(yè)的團(tuán)隊(duì)。在同客戶(hù)交易的過(guò)程中，我們力求根據(jù)不同的應(yīng)用需求將我們的產(chǎn)品做到精益求精。針對(duì)當(dāng)前和未來(lái)的市場(chǎng)需求，艾荔艾致力于為客戶(hù)提供最佳的金屬材料解決方案。
AILIAI has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. AILIAI develops the best alloy material solutions for current and future challenges.
獲取更多我們供應(yīng)的合金和服務(wù)信息，請(qǐng)致電086-021-67660801或發(fā)電子郵件[email protected]聯(lián)系我們，您也可以通過(guò)微博，微信，領(lǐng)英和推特與我們互動(dòng)。
For more information on the alloys and services that we supply,?call us?at 086-021-67660801 or email us at [email protected]. You can also get in touch on social media, we are constantly active on?Weibo,?Weixin,?LinkedIn?and?Twitter.