Effect of aluminum content on microstructure and properties of   hot-dip galvanizing coating on IF steel

doi:10.13251/j.issn.0254-6051.2020.07.037

Abstract

Abstract: Hot dip galvanizing coatings were prepared on IF steel by adding 0.2%, 1.0% and 5.0%Al (mass fraction) to the hot dip galvanizing bath, and the microstructure of the coatings was observed with the help of stereomicroscope and SEM. The three-point bending test was carried out by universal testing machine to study the effect of different Al contents on the microstructure and properties of the hot-dip galvanized coatings. The results show that the surface of the hot-dip galvanized coatings is flat but with reticular grooves, where are α(Al)+η(Zn) and Fe-Al-Zn intermetallic compounds. With the increase of aluminum content, the tortoise shell on the surface of the coatings gradually becomes smaller, and the thickness of the coatings gradually increases. Due to the high hardness and brittleness, the crack originates from the intermetallic compounds during bending. With the increase of Al content, the cracks gradually increase and arrange in parallel.

Key words: aluminum content, hot-dip galvanizing, coating structure, Fe-Al-Zn intermetallic compound, crack

CLC Number:

TG174.4

Gong Li, Jia Juan, Xiong Wei, Cheng Zhaoyang, Bi Yunjie. Effect of aluminum content on microstructure and properties of hot-dip galvanizing coating on IF steel[J]. Heat Treatment of Metals, 2020, 45(7): 183-188.

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Effect of aluminum content on microstructure and properties of hot-dip galvanizing coating on IF steel

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