摘要
The corrosion resistance of gauzes made of various materials, including Al-Mg-RE alloy with various RE contents, Al-Mg alloy, low-carbon steel and plastic, was evaluated and compared. The experimental methods used include immersion method, salt spray test, weight loss test, electrode potential analysis and metallographic method, etc. The corrosion resistance of Al-Mg-RE alloy gauzes in mediums such as running water, natural seawater, NaCl solution with various concentrations, 0.05 mol.L-1 Na2SO4 solution, and 10% H2SO4 solution etc., is superior to those of Al-Mg alloy gauzes made in either China or U.S.A., and much superior to those of gauzes made of low-carbon steel and plastic. The electrode potentials of the Al-Mg-RE alloy in both the natural seawater and 0.05 mol.L-1 Na2SO4 solution increase linearly with increasing RE content in the alloy. The microstructure in the Al-Mg-RE alloy has been refined and the shape of compounds has been obviously changed comparing with those in Al-Mg alloy without RE elements. AU these microstructural changes are favorable to the corrosion resistance of the alloy. The Al-Mg-RE alloy gauze may be used as a substitute for those made df Al-Mg alloy, low-carbon steel and plastic in moisture marine or industrial environment for better serviceability.
The corrosion resistance of gauzes made of various materials, including Al-Mg-RE alloy with various RE contents, Al-Mg alloy, low-carbon steel and plastic, was evaluated and compared. The experimental methods used include immersion method, salt spray test, weight loss test, electrode potential analysis and metallographic method, etc. The corrosion resistance of Al-Mg-RE alloy gauzes in mediums such as running water, natural seawater, NaCl solution with various concentrations, 0.05 mol.L-1 Na2SO4 solution, and 10% H2SO4 solution etc., is superior to those of Al-Mg alloy gauzes made in either China or U.S.A., and much superior to those of gauzes made of low-carbon steel and plastic. The electrode potentials of the Al-Mg-RE alloy in both the natural seawater and 0.05 mol.L-1 Na2SO4 solution increase linearly with increasing RE content in the alloy. The microstructure in the Al-Mg-RE alloy has been refined and the shape of compounds has been obviously changed comparing with those in Al-Mg alloy without RE elements. AU these microstructural changes are favorable to the corrosion resistance of the alloy. The Al-Mg-RE alloy gauze may be used as a substitute for those made df Al-Mg alloy, low-carbon steel and plastic in moisture marine or industrial environment for better serviceability.
