AASHTO M 232M/M 232-19涵盖了通过热浸工艺在钢铁五金件上涂敷的锌涂层。热浸镀锌工艺包括零件在熔融锌中浸泡足够长的时间，以允许钢表面的铁与熔融锌之间发生冶金反应，从而形成锌/铁合金层，将涂层连接到钢表面。除第4.2.3节和第5.3节注释5外，本规范符合ASTM A 153/A 153M-09。

AASHTO M 232M/M 232-19 covers zinc coatings applied by the hot-dip process on iron and steel hardware. The hot-dip galvanizing process consists of parts being immersed in molten zinc for a time sufficient to allow a metallurgical reaction between iron from the steel surface and the molten zinc, resulting in the formation of Zn/Fe alloy layers bonding the coating to the steel surface.This specification agrees with ASTM A 153/A 153M-09 except for the addition of Section 4.2.3 and Note 5 in Section 5.3.