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Effect of Dew Point and Alloy Composition on Reactive Wetting of Hot Dip Galvanized Medium Manganese Lightweight Steel

by Tong Yang 1,2,*, Yanlin He 1,2,*, Zhang Chen 1,2, Weisen Zheng 1,2, Hua Wang 3 and Lin Li 1,2
1
School of Materials Science and Engineering, Shanghai University, Shanghai 200044, China
2
State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200044, China
3
Instrumental Analysis & Research Center of Shanghai University, Shanghai 200044, China
*
Authors to whom correspondence should be addressed.
Coatings 2020, 10(1), 37; https://doi.org/10.3390/coatings10010037
Received: 9 December 2019 / Revised: 24 December 2019 / Accepted: 27 December 2019 / Published: 1 January 2020
For its application development, the medium manganese lightweight steel with 3 wt.% and 10 wt.% Mn contents was galvanized in continuous hot dip galvanizing (HDG) simulator and the process parameters on the production line were adopted. Combined with the experimental analysis and thermodynamic calculation, the effect of dew point and alloy composition on the reactive wetting of the steel was investigated. It was shown that MnO existed as a stable oxide for the medium Mn steel with 5 wt.% Al as long as Mn content exceeded 5.1 wt.%. The galvanizability of the steel with 10 wt.% Mn was deteriorated resulting from the formation of a thick and continuous external MnO layer, which had adverse effects on the wettability. MnO particles in the form of unstable phase can be found at the surface of 3Mn steel galvanized at dew point +10 °C. It distributed sparsely and the reactive wettability can be obtained by “bridging connection”, which mitigated the damage of external oxidation. Moreover, the lower dew point, the less tendency to form external oxide. Although the decrease of dew point to −30 °C had a certain benefit for coating quality, the galvanizing quality of 10Mn steel could not be improved due to the formation of a thick MnO layer. Therefore, the Mn content played a stronger role than dew point on the reactive wetting of hot dip galvanized medium manganese lightweight steel. View Full-Text
Keywords: hot dip galvanizing; zinc coating; medium manganese lightweight steel; reactive wetting; thermodynamic calculation hot dip galvanizing; zinc coating; medium manganese lightweight steel; reactive wetting; thermodynamic calculation
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Yang, T.; He, Y.; Chen, Z.; Zheng, W.; Wang, H.; Li, L. Effect of Dew Point and Alloy Composition on Reactive Wetting of Hot Dip Galvanized Medium Manganese Lightweight Steel. Coatings 2020, 10, 37.

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