Microstructure and Growth Mechanism of Inhibition Layer in Galvanized Coating on 440 MPa High Strength Steel

Journal of Chinese Society for Corrosion and protection

2013, Vol. 33

Issue (3): 188-192 DOI:

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Microstructure and Growth Mechanism of Inhibition Layer in Galvanized Coating on 440 MPa High Strength Steel

CHEN Binkai, CHEN Qingshe, ZHONG Haifeng, HAO Xiaodong, JIANG Sheming, ZHANG Qifu

New Metallurgy High-Tech Group Co., Ltd., National Engineering Lab of Advanced Coating Technology for Metal Material, Beijing 100081, China

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Abstract The microstructure of inhibition layer in galvanized coating on 440 MPa IF-HS Steel was studied by field emission environmental scanning electron microscope (FE-ESEM) and transmission electron microscope (TEM). The results showed that the inhibition layer is composed of two phases. The one is fine FeAl₃ phase, which exists as single layer on the steel substrate and underneath the coarse grains. And the another is coarse Fe₂Al₅, which exists on the surface of the inhibition layer. The growth mechanism of inhibition layer showed that FeAl₃ phase is the first forms preferentially on the steel substrate, and Fe₂Al₅ grows is through the consumption of FeAl₃ phase.

Key words: inhibition layer microstructure growth mechanism

ZTFLH:

TG174.4

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CHEN Binkai,CHEN Qingshe,ZHONG Haifeng,HAO Xiaodong,JIANG Sheming,ZHANG Qifu. Microstructure and Growth Mechanism of Inhibition Layer in Galvanized Coating on 440 MPa High Strength Steel. Journal of Chinese Society for Corrosion and protection, 2013, 33(3): 188-192.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I3/188

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