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对27Si Mn,30Cr Mn Si,30Cr Mn Ti,40Cr低合金钢以及Q550等5种液压支架常用钢在高矿化度矿井水中的腐蚀性能进行了研究,并以自来水、Na Cl溶液作为对比腐蚀介质进行比较。通过理论计算、盐雾实验、浸泡实验以及电化学实验进行了一系列腐蚀性能测试,同时利用SEM,EDS和XRD等分析手段对成分和形貌进行了分析。结果表明:Cr和Si对低合金钢的耐蚀性有较大影响:在Cl-环境下,Si的作用较大,Cr次之;在O2(水、大气)环境下,Cr的作用较大,Si次之。因此,在矿井水环境下,30Cr Mn Ti和40Cr低合金钢具有较好的耐蚀性。低合金钢在矿井水下的腐蚀,不仅与合金元素有关,还与矿物离子形成的垢膜致密性有关。水垢一方面填充了铁锈腐蚀产物疏松多孔的结构,减缓了低合金钢的腐蚀速率;另一方面,垢下区域由于电解质溶液中氧浓度较低,又加快了腐蚀速率。在3种不同腐蚀介质中,低合金钢的腐蚀程度从大到小依次为:3.5%Na Cl溶液>高矿化度矿井水>自来水。
The corrosion properties of 5 steel steels such as 27Si Mn, 30Cr Mn Si, 30Cr Mn Ti, 40Cr low alloy steel and Q550 steel in high salinity mine water were studied. The corrosion resistance of tap water and NaCl solution was compared with that of corrosive medium Compare. A series of corrosion tests were carried out by theoretical calculation, salt spray test, immersion test and electrochemical test, and the composition and morphology were analyzed by means of SEM, EDS and XRD. The results show that Cr and Si have great influence on the corrosion resistance of low alloy steels: the effect of Si is larger and the Cr is lower under Cl-environment; the effect of Cr is larger under O2 (water and atmosphere) , Followed by Si. Therefore, 30Cr Mn Ti and 40Cr low alloy steel have good corrosion resistance in mine water environment. Low alloy steel corrosion in the mine underwater, not only with the alloying elements, but also with the formation of fluoride ions on the film density. On the one hand, the scale fills the loose porous structure of the rust corrosion product and slows down the corrosion rate of the low alloy steel. On the other hand, the lower scale area accelerates the corrosion rate due to the lower oxygen concentration in the electrolyte solution. Among the three kinds of corrosive media, the corrosion of low-alloyed steel in descending order is: 3.5% NaCl solution> high salinity mine water> tap water.