Manufacturing Technology 2023, 23(5):709-716 | DOI: 10.21062/mft.2023.080

Determination of the Effect of Deformation on the Corrosion Resistance of Zn-Al-Mg Coated Sheets

Martin ©vec ORCID..., Iva Nováková ORCID..., Pavel Solfronk ORCID...
Department of Engineering Technology, Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic

In the automotive industry, deep-drawn sheet metals are widely used and protective coatings are ap-plied to its surfaces to improve certain performance properties (e.g. to increase corrosion resistance). Sheets with these coatings are stressed during the forming process of the part and cracking of the protective coating may occur. The main goal of this paper is to determine the resistance of a Zn-Al-Mg based protective coating to uniaxial and triaxial stresses, and also to determine how effective anticorrosion resistance the coating provides to the base steel matrix in the event that cracking occurs. It has been shown that both uniaxial and triaxial loading leads to a failure of the Zn-Al-Mg coating integrity. Salt spray corrosion tests of 3 and 6 weeks were subsequently performed on both deformed and undeformed base material samples. These tests showed that a continuous Al2O3 layer is formed between the steel matrix and the coating, which, irrespective of the formation of cracks in the coating, is the main contributor to the increase in corrosion resistance of the sheet.

Keywords: Corrosion resistance, Deformation of sheets, Zn-Al-Mg coating
Grants and funding:

This work was supported by the Institutional Endowment for the Long Term Conceptual 494 Development of Research Institutes, as provided by the Ministry of  Education, Youth and Sports of 495 the Czech Republic

Received: August 3, 2023; Revised: October 27, 2023; Accepted: October 27, 2023; Prepublished online: November 14, 2023; Published: December 6, 2023  Show citation

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©vec M, Nováková I, Solfronk P. Determination of the Effect of Deformation on the Corrosion Resistance of Zn-Al-Mg Coated Sheets. Manufacturing Technology. 2023;23(5):709-716. doi: 10.21062/mft.2023.080.
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