抛光态T91无缝管腐蚀原因分析

Analysis of corrosion reason for polished T91 seamless tube

在结合长期存放的自然环境和材质表面状态的基础上,从宏观和微观等方面分析了抛光态T91管发生局部腐蚀的原因并提出改进建议。分析表明,硫酸型中度酸雨及重工业大气交替等腐蚀环境是主要客观原因,而抛光态长期存放则是导致发生腐蚀的次要客观原因。针对以上结论,提出相应措施为应尽量避免抛光态T91的长期库存放置;存放环境应注意防湿防潮,尤其应杜绝被雨水淋湿或飞溅。

The corrosion reason of polished T91 seamless tube are analyzed from macro and micro aspects, based on surface condition and long-term storage in natural environment. The results show that corrosion was mainly caused by natural environment such as alternative function of sulfuric acid rain and heavy industrial atmosphere, while subordinately caused by polishing state stored for a long time. In view of the above conclusions, some suggestions are proposed as follows：It must be avoided that polished T91 is stored for a long time. Storage environment should pay attention to moisture-proof, especially should not get wet by rain or splash.