ZHU Ziyong ZHOU Xiangyang GU Jianfan KE Wei Corrosion Science Laboratory
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Academia Sinica
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Shenyang
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110015
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China
材料科学技术（英文）
Some furnace tubes made of the austenitic stainless steel 1Cr18Ni9Ti for heating crude oil ex- hibited leakage and were on fire in a refinery.Cor- rosion failure analysis was conducted to explore the cause of failure.Macro-and microexamination in- dicated the failure to be stress corrosion cracking by chloride and sulphide with cracks initiating on the inner surface in weld or heat affected zone.Veri- fying tests demonstrated that the cracks occurred during operating period.The cause of failure was related to the critical situation of the refinery:lack of desalination equipment,lots of steam with liquid film on inside tube walls owing to mixing crude oil with a great amount of water,increasing decompo- sition of inorganic salts and lowering the tempera- ture in furnace tubes.
关键词:
stress corrosion cracking
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null
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null
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null
郎经纬
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杜晓东
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金绍彤
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王夫成
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詹马骥
,
周丹
,
沈健
,
刘光复
表面技术
doi:10.16490/j.cnki.issn.1001-3660.2016.07.005
目的：研究长输管线压缩机叶片材料FV(520)B不锈钢在高含H2S、H2O、CO2条件下的腐蚀行为。方法利用高温高压反应釜模拟特定工况，在H2S分压为0.9 MPa、CO2分压为0.6 MPa、温度为150℃的条件下于5 g/L的氯化钠溶液中制备硫化腐蚀层，利用XPS、SEM、XRD等手段对腐蚀层的成分及结构进行分析。结果 FV(520)B不锈钢的腐蚀速率逐渐降低，试样表面粗糙度先增大后下降，腐蚀产物主要为FeCO3、Fe3O4、FeS、FeS2、S、Cr2S3、Cr2O3和Cr(OH)3。结论在腐蚀前期，FeS的形成速率大于 FeS2、S，腐蚀产物颗粒不断长大。形成完整的 Cr2O3、Cr(OH)3保护膜后，腐蚀得到抑制，此时腐蚀反应主要为FeS2、S的生成，试样表面腐蚀产物颗粒尺寸变小，试样表面粗糙度降低。
关键词:
FV(520)B不锈钢
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硫化腐蚀
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H2S
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CO2
