据煤炭部对140个生产矿井井筒装备腐蚀状况的调查,立井井筒中构件每年腐蚀平均厚度达0.34毫米,其中尤以江南沿海地区矿井井筒的金属腐蚀程度更大,有的年平均达0.5毫米,其腐蚀速率达到0.3～0.5克/米~2·小时。这样每年将锈蚀钢材1.8万吨,约占总安装量的3.3％,若按实际投资计算,每 According to a survey conducted by the Ministry of Coal Industry about the corrosion status of wellbore equipment in 140 production mines, the annual average corrosion thickness of shafts in shafts is up to 0.34 mm. Particularly, the metal corrosion of coal mine shafts in the coastal areas of southern China is even greater, with an average annual average of 0.5 mm. The corrosion rate of 0.3 to 0.5 g / m ~ 2 · h. This will rust steel 18,000 tons per year, accounting for about 3.3% of the total installed capacity, if calculated according to the actual investment, each