Effect of quenching water temperature on mechanical properties and corrosion resistance of Al-Mg-Si series alloy

doi:10.13251/j.issn.0254-6051.2020.10.002

Abstract

Abstract: Effect of water temperature on properties of Al-Mg-Si series alloy during solution treatment was studied by means of tensile properties test, optical microscope, scanning electron microscopy, and electrochemical performance test. The results show that with the increase of quenching water temperature during solution treatment, the tensile strength and yield strength of the alloy are not changed significantly, and the elongation and hardness of the alloy are decreased, that is, the alloy has good comprehensive mechanical properties when quenched at 20 ℃, the microhardness, the tensile strength and the yield strength are 129.4 HV0.3, 352.2 MPa, 300.9 MPa, respectively.Meanwhile, the resistance to intergranular corrosion of the alloy is gradually decreased, but the resistance to spalling corrosion is changed a little, which are both PC grades. Therefore, the alloy has the best resistance to intergranular corrosion when quenched in water at 20 ℃, and the maximum corrosion depth is 231.4 μm, which is in accord with the results of electrochemical performance test, the maximum corrosion potential is -0.834 V.

Key words: Al-Mg-Si series alloy, quenching temperature, intergranular corrosion, spalling corrosion, mechanical properties

CLC Number:

TG146.21

Wei Manxiang, He Lizi. Effect of quenching water temperature on mechanical properties and corrosion resistance of Al-Mg-Si series alloy[J]. Heat Treatment of Metals, 2020, 45(10): 6-10.

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