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煤矿中钢材的用量很大,其腐蚀问题直接关系到煤矿的安全生产和经济效益。根据全国煤矿140多个井筒的调查,矿井井筒装备用钢的年腐蚀率为0.17～0.25mm(单侧数据),井筒装备使用寿命仅9～25年。矿井中钢材腐蚀严重,主要是由于水和气流中的有害成份含量高。过去有的井筒装备未采取防护措施;有的采用沥青漆、红丹等涂料防护,但涂料使用期最长也只1～1.5年。1979年以来,煤矿井筒装备开始使用重防腐蚀长效涂料,效果明显提高。
The amount of steel in coal mines is very large, and its corrosion problems are directly related to the safety of coal mines and economic benefits. According to the survey of more than 140 wellbores in China’s coal mines, the annual corrosion rate of shaft-equipped steel is 0.17 to 0.25 mm (unilateral data), and the service life of wellbore equipment is only 9 to 25 years. The corrosion of steel in mines is serious, mainly due to the high content of harmful components in water and gas streams. Some wellbore equipment in the past did not take protective measures; some use asphalt paint, red lead and other paint protection, but the longest paint life only 1 ~ 1.5 years. Since 1979, coal mine shaft equipment began to use heavy anti-corrosion long-lasting paint, the effect was significantly improved.