MSE 2022
Poster
APPLICATION AND CHARACTERIZATION OF A NOVEL HIGH CORROSION RESISTANT, FLEXIBLE, TRANSPARENT THIN POLYMER COATING ON GALVANIZED FLAT STEEL
BA

Beyzanur Aydin (B.Sc.)

Borçelik Çelik Sanayii Ticaret A.Ş.

AYDIN, B. (Speaker)¹; OZGULTEKIN, A.G. (Speaker)¹; SEYALIOGLU, C. (Speaker)¹; CABA SERBETCI, O.²; CAKAR DAVASLIOGLU, I.²
¹Borusan - Borcelik Celik Sanayii Ticaret A.S, Istanbul (Turkey); ²DYO Boya Fabrikaları A.S., Izmir (Turkey)

Corrosion, is one of the essential industrial problems and yields very high economic losses in the long run. Hot-dip galvanizing is a well-known method of coating steel surfaces with zinc alloy to make them more resistant to corrosion. Hot-dip galvanized (HDG) sheet steels are usually shaped into products via forming processes including bending and deep drawing steps. Depending on formability limits of steel sheet, the zinc coating on the surface may end up with problems such as thinning and micro-cracks during production. Thus, the continuity of the zinc coating is disrupted causing it to lose its corrosion barrier property. Although it is not possible to prevent long-term corrosion completely, it is possible to delay it with additional protective coatings on the material surface. In this study, a flexible and transparent polymeric-based organic coating was employed on HDG sheet samples. Coated steel sheets as well as thin organic coatings were tested and examined in terms of dry film thickness, adhesion, salt spray corrosion resistance and formability performance under cupping, mandrel bending and impact to foresee manufacturing and service performance. Film thickness, continuity and homogeneity of the developed coating on galvanized steel surface was measured via SEM. The adhesion performance, which directly affects both formability and corrosion was high and hence the results of physical tests i.e. T-bend and strength were favorable. No cracking or loss of adhesion was observed on sheet surfaces after the tests. Compared to original galvanized steel substrates, novel organic film coated galvanized sheets demonstrated a substantial increase in their white rust formation time upon salt spray test conditions. To sum up, highly corrosion resistant and formable steel sheets were obtained via creation of a novel thin organic coating on zinc coated steel surface.

Abstract

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