In order to understand the corrosion resistance of hot-dip galvanized anchors in neutral environment,neutral salt spray tests of ordinary anchors and hot-dip galvanized anchors were carried out for 6,12,18,24,30,36 and 42 days.The macroscopic performance degradation law of ordinary anchors and hot-dip galvanized anchors in neutral and humid environment was studied,and the microscopic corrosion products of hot-dip galvanized anchors were analyzed.The results show that the corrosion resistance of hot-dip galvanized anchor is much higher than that of ordinary anchor in neutral environment.After 42 days of test,the mass of ordinary anchor rod and hot-dip galvanized anchor rod decreased by 32.96 g and 7.12 g respectively.The yield strength decreased by 44.73 MPa and 8.75 MPa,respectively.The tensile strength decreased by 47.83 MPa and 8.54 MPa,respectively.The main corrosion product of the hot-dip zinc bolt is ZnO in the early stage of the test,and the protective corrosion product Zn5(OH)8Cl2·H2O is formed after 18 days of the test.The adhesion protection of the two corrosion products is the main reason why the hot-dip zinc bolt always maintains low-speed corrosion in the test.The zinc layer on the surface of hot-dip galvanizing can be divided into pure zinc layer and zinc-iron alloy layer.The pure zinc layer can act as a barrier to the corroded mine,and the zinc-iron alloy layer can provide electrochemical protection for the anchor base metal.The industrial test shows that the hot-dip galvanized anchor has better corrosion resistance than the ordinary anchor in the actual mine environment.
关键词
锚杆腐蚀/热浸锌/腐蚀行为/腐蚀产物/防腐机理
Key words
anchor rod corrosion/hot-dip zinc/corrosion behavior/corrosion products/anticorrosion mechanism
维普
万方数据