Structures and Formation Behavior of Coating Layer in Two-step Zn-Al Hot-Dipped Steel.

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  • 二段階溶融Ｚｎ‐Ａｌめっき鋼のめっき層組織とその形成挙動
  • 2ダンカイ ヨウユウ Zn Al メッキ コウ ノ メッキソウ ソシキ ト ソ

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Abstract

Structures and its formation behavior of coating layer formed on steel by two-step hot-dipping method i e., primary dipping in a zinc bath followed by immersion in a secondary Zn-7 mass%Al bath, were studied using scanning electron microscope (SEM), electron probe micro-analysis (EPMA) and X-ray diffraction analysis (XRD). Primary dipping layers composed mainly of ζ phase and trace of η phase. The columnar structure changed to a fine acicular structure with a Fe4Al13-Znx phase at temperatures below 693K. Above 703K, it became a two-phase structure of a plate-like Fe2Al5-Znx and a fine broken acicular Fe4Al13-Znx phase. A Zn-Al coating layer over 50μm thick was obtained by secondary immersion between 683K and 733K for steel dipped into a primary bath at 763K.

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