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为提高TC4合金的高温抗氧化能力,采用二步法在其表面制备了一种复合涂层。采用微弧氧化工艺在偏铝酸钠电解液中于合金表面原位沉积多孔膜层,然后采用溶胶凝胶提拉浸渍工艺在微弧氧化膜层表面进行封孔处理,并进行后续热处理。SEM和EDS结果表明,膜层总厚度为6μm,封孔层厚度约为1μm。高温氧化实验结果表叫,随着氧化时问的延长,封孔后样品的抗氧化能力也随之提高,与未封孔样品相比,其氧化增重大大降低。微弧氧化膜的表面多孔状态为封孔的溶胶层提供了天然锚固接触点,从而能够起到良好的密封作用。
In order to improve the high-temperature oxidation resistance of TC4 alloy, a two-step method was used to prepare a composite coating on the surface. The micro-arc oxidation process was used to deposit the porous membrane layer on the surface of the alloy in the electrolyte of sodium aluminate solution. Then, the surface of the micro-arc oxidation membrane was sealed by sol-gel pulling and impregnating process, and the subsequent heat treatment was carried out. SEM and EDS results show that the total thickness of the film is 6μm, the thickness of the sealing layer is about 1μm. The results of the high temperature oxidation test result show that with the prolongation of oxidation time, the antioxidant capacity of the samples after sealing increases. Compared with the non-sealed samples, the oxidation weight gain is greatly reduced. Micro-arc oxidation of the porous surface of the membrane for the sealing of the sol layer provides a natural anchor contact point, which can play a good seal.