Patent ID: 11898252
Assignee: POSCO CO., LTD
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 12:
13. The method of claim 12, wherein an alloying temperature is controlled to satisfy the following Relational Expression 1:

150−0.4×[T]+3.3×10−4×[T]2−0.38×[wt % Zn]≤[wt % Fe]≤180−0.4×[T]+3.3×10−4×[T]2−0.38×[wt % Zn]  [Relational Expression 1]

wherein [T] represents an alloy heat treatment temperature (° C.), [wt % Zn] represents a content of Zn wt % in the plating bath, and [wt % Fe] represents a content of Fe wt % in an alloy-plated layer.