石油化工腐蚀与防护
石油化工腐蝕與防護
석유화공부식여방호
PETROCHEMICAL CORROSION AND PROTECTION
2012年
4期
57-60
,共4页
球罐%应力导向氢致开裂%裂纹%硫化氢
毬罐%應力導嚮氫緻開裂%裂紋%硫化氫
구관%응력도향경치개렬%렬문%류화경
spherical tank%stress oriented hydrogen induced cracking%cracking%H2S
某公司一台液态烃球罐,按计划进行大修检查时在内表面发现较多微裂纹,裂纹最深达5.9mm。在现场检查、测厚、金相分析、腐蚀产物分析并结合工艺情况分析的基础上,初步判断裂纹是应力导向氢致开裂裂纹,裂纹产生的主要原因是罐内物料介质中硫化氢含量严重超标。建议在罐内采用涂层或阴极保护层的方法来阻止或减缓湿硫化氢环境中的腐蚀,从而降低裂纹的产生与发展的可能性。
某公司一檯液態烴毬罐,按計劃進行大脩檢查時在內錶麵髮現較多微裂紋,裂紋最深達5.9mm。在現場檢查、測厚、金相分析、腐蝕產物分析併結閤工藝情況分析的基礎上,初步判斷裂紋是應力導嚮氫緻開裂裂紋,裂紋產生的主要原因是罐內物料介質中硫化氫含量嚴重超標。建議在罐內採用塗層或陰極保護層的方法來阻止或減緩濕硫化氫環境中的腐蝕,從而降低裂紋的產生與髮展的可能性。
모공사일태액태경구관,안계화진행대수검사시재내표면발현교다미렬문,렬문최심체5.9mm。재현장검사、측후、금상분석、부식산물분석병결합공예정황분석적기출상,초보판단렬문시응력도향경치개렬렬문,렬문산생적주요원인시관내물료개질중류화경함량엄중초표。건의재관내채용도층혹음겁보호층적방법래조지혹감완습류화경배경중적부식,종이강저렬문적산생여발전적가능성。
In the scheduled overhaul investigation of a liquid hydrocarbon spherical tank in a company, many micro cracks were found in the internal wall, whose maximum depth was 5.9 mm. The site investigation, thickness measurement, metallographic analysis, corrosion product analysis and process condition analysis preliminarily concluded that the cracks were stress oriented hydrogen induced cracking （ SOHIC ） , which was mainly caused by serious off - specifications of H2S in storage media in spherical tank. It was suggested to apply coating or cathodic protection to prevent or mitigate the corrosion in wet H2S environment.
