Heat treatment process for improving corrosion resistance of Mg-Zn-Y-Zr magnesium alloy
A corrosion-resistant, magnesium alloy technology, applied in the field of magnesium alloy performance optimization, can solve the problems of lack of safety guarantee and technical support in engineering applications, achieve the elimination of structural inhomogeneity, improve corrosion resistance, and solve problems of poor corrosion resistance Effect
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Embodiment 1
[0022] The present embodiment improves the heat treatment process method of Mg-Zn-Y-Zr magnesium alloy corrosion resistance, mainly comprises the following steps:
[0023] Ⅰ), the composition of the magnesium alloy used: use the forged state quasicrystalline strengthened Mg-Zn-Y-Zr magnesium alloy, its chemical composition (mass percentage content) is: 6% Zn, 1.2% Y, 0.8% Zr, the rest is Mg;
[0024] Ⅱ) Solid solution treatment process: Wrap the forged quasicrystalline strengthened magnesium alloy sheet tightly with aluminum foil, solid solution at 330°C for 2 hours, raise the temperature to 400°C with the furnace, keep the temperature for another 4 hours, and cool to room temperature by water quenching.
[0025] Ⅲ), microstructure characterization
[0026] The preparation process of the sample for microstructure observation is as follows: use No. 1000 silicon carbide water abrasive paper to smooth the surface; then use oil-based diamond abrasive paste to mechanically polish;...
Embodiment 2
[0031] The difference from Example 1 is:
[0032] Ⅰ), the composition of the magnesium alloy used
[0033] Refer to the composition ratio of Example 1.
[0034] Ⅱ), solid solution treatment process
[0035] Wrap the forged quasicrystalline strengthened magnesium alloy plate tightly with aluminum foil, solid solution at 320°C for 2 hours, then raise the temperature to 400°C, keep it warm for 4 hours, and cool it to room temperature by water quenching.
[0036] Ⅲ), microstructure characterization
[0037] Refer to the microstructure characterization of Example 1.
[0038]Ⅳ) Tensile property test at room temperature
[0039] Refer to the mechanical property testing method of Example 1. In this example, the corrosion and tensile properties of the alloy are shown in Table 1, and its weight loss rate is 0.50 mg / cm 2 / day, corrosion potential E corr =-1.63V SCE , corrosion current i corr =10.5μA / cm 2 . Its yield and tensile strengths are 195MPa and 272MPa, respectively, an...
Embodiment 3
[0041] The difference from Example 1 is:
[0042] Ⅰ), the composition of the magnesium alloy used
[0043] Refer to the composition ratio of Example 1.
[0044] Ⅱ), solid solution treatment process
[0045] Wrap the forged quasicrystalline strengthened magnesium alloy sheet tightly with aluminum foil, solid solution at 300°C for 2 hours, then raise the temperature to 400°C, keep it warm for 4 hours, and cool it to room temperature by water quenching.
[0046] Ⅲ), microstructure characterization
[0047] Refer to the microstructure characterization of Example 1.
[0048] Ⅳ) Tensile property test at room temperature
[0049] Refer to the mechanical property testing method of Example 1. In this example, the corrosion and tensile properties of the alloy are shown in Table 1, and its weight loss rate is 0.62 mg / cm 2 / day, corrosion potential E corr =-1.62V SCE , corrosion current i corr =13.5μA / cm 2 . Its yield and tensile strengths are 198MPa and 276MPa, respectively, a...
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