Abstract
Hot dipping Zn-Al-Mg coatings were prepared by rapid induction heating combined with gas protection. The influence of oxide scale on the structure and surface quality of a hot-dip Zn-6Al-3Mg alloy coating was studied in this paper. The results showed that the reaction of Fe-Al was suppressed by the scale on the surface of the steel plate. When the thickness of scale was 10 μm and the steel entry temperature was 900 °C, the surface quality of the coating was good. The Zn-Al-Mg coatings mainly consisted of the ternary eutectic structure of Zn/Al/MgZn2 and Fe4Al13 at the interface. When the scale thickness was 2–3 μm with the same steel entry temperature, the surface quality of the coating was poor, and serious stripe-like protrusion defects were formed on the surface of the coating, which was mainly caused by the Fe4Al13 phase separating from the substrate / coating interface into the overlay.
Highlights
Steel undergoes corrosion when exposed to different environments
The phase structures of the Zn-6Al-3Mg alloys were examined by X-ray diffraction 3(XRD; D8 of 14
The phase structures of the Zn-6Al-3Mg alloys were examined by X-ray diffraction (XRD; Advance, Bruker, Germany) at 25 ◦Hot
Summary
Hot-dip galvanizing and its alloy coatings are widely used in steel protection [1]. Solvent method is used in the traditional hot-dip galvanizing alloy process, to obtain a clean surface that is beneficial to the combination of the alloy bath and the steel matrix by pickling the steel plate [19]. Researchers have conducted a series of studies on hot dip galvanizing by the reduction method, and found that the composition of oxide scale of hot-rolled steel with different ingredients was different, leading to the great difference in the reduction process [23,24,25,26,27,28]. Some studies have paid attention to the microstructure of coatings obtained by hot-dip Zn and Zn-Al alloys after a reduction of hot-rolled steel sheets. The environmental pollution caused by the acid pickling of the pre-treatment process and the evaporation of the solvent during the hot dipping process was avoided by this technology
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
