镍基铸造高温合金K35的热腐蚀行为

中国腐蚀与防护学报

2005, Vol. 25

Issue (4): 250-255

研究报告

本期目录 | 过刊浏览

镍基铸造高温合金K35的热腐蚀行为

李云;郭建亭;袁超;杨洪才;方龙;刘学贵

中国科学院金属研究所;沈阳化工学院;东北大学

HOT CORROSION OF NICKEL-BASE CAST SUPERALLOY K35 AT 800℃

Yun LI;Jianting Guo;Chao YUAN;Hongcai YANG;Long FANG;Xuegui LIU

中国科学院金属研究所;沈阳化工学院;东北大学

全文: PDF(224 KB)

摘要: 研究了涂有75%Na2SO4+25%NaCl盐膜的镍基铸造高温合金K35在800℃～900℃的热腐蚀行为.结果表明，该合金在实验条件下发生高温热腐蚀.在800 ℃，腐蚀动力学曲线大体遵循抛物线规律.腐蚀产物分为3个区域：即外层是以Cr2O3为主相对致密的具有保护性的氧化层，中间层是富Ti层，内层是以Al、Ti为主的氧化物.腐蚀形貌观察说明，热腐蚀的发展主要伴随着致密氧化层的增厚以及Cr2O3保护性氧化膜的挥发，且涂盐导致Cr2O3挥发温度降低.在800℃及850℃表面有少量硫化物形成，随腐蚀温度增高有内硫化物产生.腐蚀动力学和腐蚀形貌特点支持热腐蚀的硫化-碱融机理模型.

关键词 ：热腐蚀, 镍基铸造高温合金, 硫化—碱融机理

Abstract：Hot corrosion behavior of nickel-base cast superalloy K35 in the presence of a thin film of 75%Na2SO4+25%NaCl in air at 800℃～900℃ was studied.The results showed that the superalloy was subjected to “high temperature" hot corrosion attack under the experimental condition.The kinetics curve of hot corrosion followed basically the parabolic law.Corroded products can be divided into three layers,which external scales of Cr2O3 formed mainly, intermediate layer was Ti-rich,internal layer was mainly oxides of Al.For the corrosion process,especially in the steady state,the development of hot corrosion was characterized by the rapid growth of the compact oxide layer and was accompanied by some volatility of Cr2O3，which volatile temperature is decreased by coating the film of salt on the specimens.There are a little sulfides on the surface of the specimens at 800℃ and 850℃.With increasing temperature internal sulfides were formed.The corrosion kinetics and morphology examinations tend to support the sulphidization-basic dissolution model previously proposed for hot corrosion mechanism.

Key words： hot corrosion nickel-based cast superalloy sulphidization-basic dissolution mechanisms

收稿日期: 2004-04-15

ZTFLH:

TG146.13

通讯作者: 李云 E-mail: liyun@syict.edu.cn

Corresponding author: Yun LI E-mail: liyun@syict.edu.cn

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引用本文:

李云; 郭建亭; 袁超; 杨洪才; 方龙; 刘学贵 . 镍基铸造高温合金K35的热腐蚀行为[J]. 中国腐蚀与防护学报, 2005, 25(4): 250-255 .
Yun LI, Jianting Guo, Chao YUAN, Hongcai YANG, Long FANG, Xuegui LIU. HOT CORROSION OF NICKEL-BASE CAST SUPERALLOY K35 AT 800℃. J Chin Soc Corr Pro, 2005, 25(4): 250-255 .

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2005/V25/I4/250

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