激光熔敷合金层
laser remelted alloy coating
化学镀镍合金层
electroless nickel coating
热镀Zn-Al-Mg合金层
hot-dipping Zn-Al-Mg alloy coating
渗铌合金层
Nb alloying layer
niobium modified surface alloying layer
碳化钨硬质合金层
WC cemented carbide layer
锌及锌合金层
Zinc and Zinc Alloy Coating
过渡合金层
transition alloy bead welded layer