| 摘要 |
An Al-Cr alloy vapour deposited product having high corrosion resistance comprises a substrate and an Al-Cr alloy layer deposited thereon containing 1-50 wt % of Cr. The alloy may contain 1-30 wt % Cr and consists mainly of Al, Cr and (-) phase (Al13Cr2). Numerous examples of specific alloys are provided. The Al-Cr alloy may be formed as a second layer over a first layer of Si, Cu, Al-Si alloy, Al or Cr alloy and in one embodiment the Al-Cr alloy is deposited over a Cr deposit layer and the Al-Cr alloy is covered with an Al deposited layer. A ternary or multi-component Al alloy layer may be deposited, the other alloying ingredient preferably being Si or Ti. The alloy layers may be deposited by physical vapour deposition using plural deposition sources, ion plating or sputtering. Plural deposition sources are used to produce deposited layers in which either the chromium content gradually increases with distance across the thickness of the layer such that the Cr content is minimum at the interface between the layer and the substrate metal or the chromium content gradually increases with distance across the thickness of the layer such that the Cr content is maximum at the interface between the layer and the substrate metal. The plated product finds use in automotive exhaust mufflers, store heat reflectors and building materials. The substrste may be steel, Al-alloy or Cu-alloy. |
