25Cr3Mo低合金钢在模拟矿井水环境下的腐蚀磨损行为

Tribocorrosion Behavior of 25Cr3Mo Low Alloy Steel in Simulated Coal Mine Water Environment

以25Cr3Mo低合金钢为研究对象,探索酸性、中性及碱性三种模拟矿井水环境下,采煤机滑靴材料25Cr3Mo钢表面的腐蚀磨损损伤行为。通过分析摩擦系数曲线、磨损形貌、元素分布及其化学态,定量计算不同条件下的比磨损率,揭示采煤机滑靴在模拟矿井水下的损伤机理。结果表明:25Cr3Mo钢在酸性、中性矿井中的稳定摩擦系数约为0.15,而在碱性矿井水下稳定摩擦系数下降至0.10,均小于干摩擦环境下的摩擦系数(0.27)。三种模拟矿井水下,25Cr3Mo钢的比磨损率相较于干摩擦均可降低一个数量级,但模拟矿井水环境中,25Cr3Mo钢表面会形成大量腐蚀凹坑,最大深度可达3.42μm。在酸性和中性矿井水下,25Cr3Mo表面的腐蚀产物均为Fe_(3)O_(4),且酸性环境中的腐蚀产物层出现大量微裂纹,而碱性矿井水下腐蚀产物中既含有Fe_(3)O_(4),又有α-FeOOH和α-Fe_(2)O_(3)。

Taking 25Cr3Mo low alloy steel as the research object,the corrosion and wear behavior of 25Cr3Mo steel for sliding shoes of coal mining machine under three simulated mine water environments(acidic,neutral,and alkaline)were studied.By analyzing the friction coefficient curve,wear morphology,element distribution,chemical state and quantitatively calculating the specific wear rate under different conditions,the damage mechanism of shearer sliding shoes under simulated mine water was elucidated.The results show that the stable friction coefficient of 25Cr3Mo steel in acidic and neutral mine environments is approximately 0.15,whereas it decreases to 0.10 in alkaline mine water,both of which are lower than the friction coefficient under dry friction conditions(0.27).The wear rate of 25Cr3Mo steel in simulated mining water environments can be reduced by one order of magnitude compared with that under dry friction.However,the surface of 25Cr3Mo steel in the simulated mining water environments exhibits a significant number of corrosion pits with a maximum depth up to 3.42μm.Under acidic and neutral conditions,the corrosion products on the 25Cr3Mo surface consist of Fe:04.Moreover,a considerable number of microcracks emerge within the corrosion product layer under acidic condition.However,under alkaline mine water,the corrosion products consist of Fe_(3)O_(4),α-FeOOH andα-Fe_(2)O_(3).