关键词: 锚杆锚索, 矿井水, 均匀腐蚀, 腐蚀速率, 电化学特性

Abstract: Rockbolts and cables were prone to corrosion affected by mine water, which usually lead to the degradation of mechanical properties and failure. The basic properties, electrochemical characteristics and corrosion rates of hot-rolled 335, hot-rolled 500, heat-treated 600, heat-treated 700 rockbolts and 1860MPa cables in simulated highly-mineralized mine water were tested and analyzed by chemical composition analysis, microstructure observation and electrochemical tests. The main conclusions were as follows: ①The polarization characteristics of rockbolts and cables tested were active dissolved similarly.②In the simulated corrosive solution, the corrosion rate of heat-treated 600 was the lowest and hot-rolled 500 the highest, with an average corrosion rate of 0.2mm/a. The average corrosion rate of hot-rolled rockbolts was about 1.5 times that of heat-treated ones. The corrosion rate of cable was about one tenth of that of rockbolt.③The pH of mine water had a significant effect on rockbolt corrosion rate, which reached the maximum in pH=2.When pH=5, the corrosion rate decreased to about 20% of that in pH=2. When in pH=5-12, namely weak acid, neutral and alkaline solutions, the corrosion rate decreased slightly in general.④Cl- concentration had certain influence on the corrosion rate of bolt. The corrosion rates of the four rockbolts decreased gradually when Cl- concentration increased from 0.906mmol/L to 90.6mmol/L. When increased to 906mmol/L, the corrosion rate of hot-rolled rockbolt continued to decrease, while that of heat-treated rockbolt began to increase. The corrosion rate of cable increased by 13.35% in 100 times Cl- concentration solution.