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采用放电合金化工艺对AA6082 Al-Mg-Si时效硬化铝合金进行表面改性。在放电合金化过程中,作为工作液的煤油热解成碳,从而形成附着于合金表面的自润滑碳化物层。TEM结果表明,合金表面形成的自润滑碳化物层为由碳化物和石墨组成的多相材料。因此,经放电合金化改性铝合金的摩损率极小,约为2×10~(-4) mg/m,而铝合金基体的磨损率约为1.1×10~(-2) mg/m。显然,在铝合金表面经放电合金化形成的碳化物为一种能改善合金抗电磁干扰性能的软磁体。
The AA6082 Al-Mg-Si age-hardened aluminum alloy was surface-modified by discharge alloying. During discharge alloying, kerosene as a working fluid is pyrolyzed into carbon to form a self-lubricating carbide layer attached to the alloy surface. TEM results show that the self-lubricating carbide layer formed on the alloy surface is a multiphase material composed of carbide and graphite. Therefore, the wear rate of the modified alloying alloy after discharge is very small, about 2 × 10 -4 mg / m, while the wear rate of the aluminum alloy substrate is about 1.1 × 10 -2 mg / m. Obviously, the carbide formed by discharge alloying on the surface of aluminum alloy is a kind of soft magnet which can improve the anti-electromagnetic interference performance of the alloy.