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

IF 1.6 Q4 ENGINEERING, MANUFACTURING Manufacturing Technology Pub Date : 2023-11-14 DOI:10.21062/mft.2023.080
Martin Švec, Iva Nováková, Pavel Solfronk
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Abstract

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.
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变形对锌铝镁镀膜板耐蚀性影响的测定
在汽车工业中,深拉深金属板被广泛使用,并在其表面涂上保护涂层以改善某些性能(例如增加耐腐蚀性)。具有这些涂层的薄板在零件成形过程中受到应力,保护涂层可能发生开裂。本文的主要目的是确定Zn-Al-Mg基保护涂层对单轴和三轴应力的抵抗能力,以及确定在发生裂纹的情况下涂层对基体钢的有效抗腐蚀能力。结果表明,单轴和三轴载荷均会导致Zn-Al-Mg镀层完整性的破坏。随后对变形和未变形的基材样品进行了3周和6周的盐雾腐蚀试验。试验结果表明,在钢基体和涂层之间形成了连续的Al2O3层,这与涂层中裂纹的形成无关,是提高板材耐蚀性的主要原因。
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来源期刊
Manufacturing Technology
Manufacturing Technology Engineering-Industrial and Manufacturing Engineering
CiteScore
2.10
自引率
44.40%
发文量
65
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