JIS H 8643:2019规定了用于钢制品或装配式钢制品（以下简称基材）防腐的热浸锌铝合金镀锌层（以下简称涂层）有效表面的要求。本标准不适用于JIS G 3317和JIS G 3323中规定的热浸锌铝合金涂层钢板和钢带，或连续镀锌的热浸锌铝合金涂层铁丝和钢丝。

JIS H 8643:2019 specifies requirements for the significant surface of hot-dip zinc-aluminium alloy galvanized coating (hereafter referred to as coatings) applied on steel products or fabricated steel products (hereafter referred to as substrates) for the purpose of corrosion prevention. This Standard does not apply to hot-dip zinc-aluminium alloy-coated steel sheets and strips specified in JIS G 3317 and JIS G 3323, or hot-dip zinc-aluminium alloy-coated iron wires and steel wires that are continuously galvanized.