Version 1
: Received: 5 August 2023 / Approved: 7 August 2023 / Online: 7 August 2023 (10:05:29 CEST)
How to cite:
Tian, C.; Li, F. Study on Microstructures and Resist Corrosion Properties of Two-Step Hot-Dipping Al - Zn Composite Coating on Q345 Steel. Preprints2023, 2023080484. https://doi.org/10.20944/preprints202308.0484.v1
Tian, C.; Li, F. Study on Microstructures and Resist Corrosion Properties of Two-Step Hot-Dipping Al - Zn Composite Coating on Q345 Steel. Preprints 2023, 2023080484. https://doi.org/10.20944/preprints202308.0484.v1
Tian, C.; Li, F. Study on Microstructures and Resist Corrosion Properties of Two-Step Hot-Dipping Al - Zn Composite Coating on Q345 Steel. Preprints2023, 2023080484. https://doi.org/10.20944/preprints202308.0484.v1
APA Style
Tian, C., & Li, F. (2023). Study on Microstructures and Resist Corrosion Properties of Two-Step Hot-Dipping Al - Zn Composite Coating on Q345 Steel. Preprints. https://doi.org/10.20944/preprints202308.0484.v1
Chicago/Turabian Style
Tian, C. and Faguo Li. 2023 "Study on Microstructures and Resist Corrosion Properties of Two-Step Hot-Dipping Al - Zn Composite Coating on Q345 Steel" Preprints. https://doi.org/10.20944/preprints202308.0484.v1
Abstract
Q345 steel is widely used in the construction industry, vehicle manufacturing industry, bridge construction industry and many other aspects due to its excellent comprehensive performance. However, due to its high silicon content, direct hot-dip galvanizing will lead to a series of problems, such as easy peeling of the coating due to the "silicon reactivity". In this paper, we adopt the "two-step hot-dipping method", first hot-dip aluminizing and then hot-dip galvanizing, to isolate the substrate and zinc liquid direct contact, so as to avoid the occurrence of "silicon reactivity". Through the microstructure characterization, neutral salt spray corrosion experiments, electrochemical experiments, the results show that: Al-Zn composite coatings from the inside out were perpendicular to the substrate growth of loose Fe2Al5 layer and Al-Zn layer, outbursts generation; Al-Zn composite coatings resistance to neutral salt spray corrosion was far more than the substrate; Al-Zn composite coatings polarization curve corrosion potential than the substrate was lower than that of the substrate by 0.512V, showing a strong corrosion resistance. It shows extremely strong corrosion resistance.
Chemistry and Materials Science, Surfaces, Coatings and Films
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
