Corrosion behaviour and surface topography for steel plates used in automotive industry exposed to salty corrosive thermo-accelerated medium

Abbas Abdulsada, Shaymaa and I. Al-Mosawi, Ali (2022) Corrosion behaviour and surface topography for steel plates used in automotive industry exposed to salty corrosive thermo-accelerated medium. ÉPÍTŐANYAG – JOURNAL OF SILICATE BASED AND COMPOSITE MATERIALS, 74 (6). pp. 218-223. ISSN 0013-970X (nyomtatott); 2064-4477 (online)

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Abstract

Corrosion resistance is one of the essential criteria in the automotive industry, especially in harsh climates, as it causes severe damage to vehicles. Therefore, the anti-corrosion factor should be a complementary and integral part of other safety standards. An experimental investigation for monitoring and evaluating the corrosion behavior of high strength low carbon steel plates with different surface characteristics and treatments conditions used in the automotive industry exposed to a salty, corrosive thermo-accelerated medium has been introduced in this empirical study. The produced samples are divided into four main groups: welded, unwelded, coated, and uncoated. These samples were exposed to an aggressive chemical medium consisting of salty-aqueous spray with a 5% NaCl concentration at 35°C with speed and pressure. All changes in surface features, including topography, roughness, and corrosion products, were measured and analyzed periodically every 8 hours for 24 hours by scanning electron microscopy, optical microscopy, and CSPM imager surface roughness analysis. The results showed that the coated samples had lower roughness values and lower corrosion products after 24 hours under the salty-aqueous spray test.

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