表面技术
錶麵技術
표면기술
Surface Technology
2015年
11期
104-111
,共8页
王秀民%王培%孙阳超%廉兵杰
王秀民%王培%孫暘超%廉兵傑
왕수민%왕배%손양초%렴병걸
Q235钢%海洋大气%腐蚀%盐雾%恒温恒湿%温度%氯离子含量
Q235鋼%海洋大氣%腐蝕%鹽霧%恆溫恆濕%溫度%氯離子含量
Q235강%해양대기%부식%염무%항온항습%온도%록리자함량
Q235 mild steel%marine atmospheric%corrosion%salt mist%constant temperature and humidity%temperature%chloride ion concentration
目的 研究Q235钢在海洋大气环境中的耐蚀性能,分析近海环境下Q235钢的腐蚀机理. 方法采用盐雾试验、恒温恒湿试验等,模拟海洋大气环境,研究不同温度、相对湿度、氯离子含量下Q235钢的腐蚀规律,并利用表观腐蚀形貌分析、金相分析及XRD等技术手段,分析对应的腐蚀形貌和腐蚀产物.结果 模拟海洋大气环境下,Q235钢腐蚀速率随温度升高而增加. 随着氯离子含量增加,Q235钢腐蚀速率先增加后减小,当NaCl质量分数为1 . 75%时,其腐蚀速率最大. 相对湿度增大可以加速Q235钢腐蚀,相对湿度大于85%后,其腐蚀速率急剧增大. 盐雾环境下,Q235钢的腐蚀类型为点蚀,主要腐蚀产物为Fe2 O3 和Fe3 O4. 结论 海洋大气环境下,温度、相对湿度、氯离子含量均为Q235钢腐蚀的重要影响因素,腐蚀危害表现为点蚀穿孔,需要采取表面防护措施.
目的 研究Q235鋼在海洋大氣環境中的耐蝕性能,分析近海環境下Q235鋼的腐蝕機理. 方法採用鹽霧試驗、恆溫恆濕試驗等,模擬海洋大氣環境,研究不同溫度、相對濕度、氯離子含量下Q235鋼的腐蝕規律,併利用錶觀腐蝕形貌分析、金相分析及XRD等技術手段,分析對應的腐蝕形貌和腐蝕產物.結果 模擬海洋大氣環境下,Q235鋼腐蝕速率隨溫度升高而增加. 隨著氯離子含量增加,Q235鋼腐蝕速率先增加後減小,噹NaCl質量分數為1 . 75%時,其腐蝕速率最大. 相對濕度增大可以加速Q235鋼腐蝕,相對濕度大于85%後,其腐蝕速率急劇增大. 鹽霧環境下,Q235鋼的腐蝕類型為點蝕,主要腐蝕產物為Fe2 O3 和Fe3 O4. 結論 海洋大氣環境下,溫度、相對濕度、氯離子含量均為Q235鋼腐蝕的重要影響因素,腐蝕危害錶現為點蝕穿孔,需要採取錶麵防護措施.
목적 연구Q235강재해양대기배경중적내식성능,분석근해배경하Q235강적부식궤리. 방법채용염무시험、항온항습시험등,모의해양대기배경,연구불동온도、상대습도、록리자함량하Q235강적부식규률,병이용표관부식형모분석、금상분석급XRD등기술수단,분석대응적부식형모화부식산물.결과 모의해양대기배경하,Q235강부식속솔수온도승고이증가. 수착록리자함량증가,Q235강부식속솔선증가후감소,당NaCl질량분수위1 . 75%시,기부식속솔최대. 상대습도증대가이가속Q235강부식,상대습도대우85%후,기부식속솔급극증대. 염무배경하,Q235강적부식류형위점식,주요부식산물위Fe2 O3 화Fe3 O4. 결론 해양대기배경하,온도、상대습도、록리자함량균위Q235강부식적중요영향인소,부식위해표현위점식천공,수요채취표면방호조시.
Objective To investigate the corrosion-resisting function of the Q235 steel in the ocean air atmosphere, and figure out the corrosion mechanism of the Q235 steel in the offshore environment. Methods Salt spray test and constant temperature and humidity test were used to study the corrosion rules of the Q235 steel at different temperatures, relative humidifies and chloride ion contents in simulated ocean air atmosphere. Surface corrosion morphology analysis, metallographic analysis and XRD component a-nalysis were used to analyze the respective corrosion morphology and corrosion products. Results With increasing temperature, the corrosion rate of Q235 steel under the simulated ocean air environment was raised. With increasing chloride ion concentration, the corrosion rate was elevated in the initial stage and peaked when the chloride ion concentration was 1. 75%, after which the corro-sion rate started to decrease. With increasing relative humidity, the corrosion rate of Q235 steel was accelerated, especially when the relative humidity was larger than 85%. In addition, in the salt spray environment, the corrosion manifestation of Q235 steel was pitting corrosion and the major corrosion products were Fe2 O3 and Fe3 O4 . Conclusion Under the ocean air atmosphere, tem-perature, humidity and chloride ion content are all important factors that can lead to severe corrosion of the Q235 steel, and the major corrosion manifestation is pitting perforation. Therefore, surface protection measures for Q235 steel must be taken.
