自動車用熱延鋼板の耐孔あき腐食性に及ぼす合金元素の影響

概要

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The effect of alloying elements on perforation corrosion of mild steel was studied by cyclic corrosion tests and an outdoor exposure test. Ultra low C-P-Cu hot rolled steel has been alloy-designed for the perforation corrosion resistance application for the automotive bodies. The newly designed TS 45kgf/mm^2 steel, produced in the mill, shows the excellent mechanical properties and an equivalent paintability to a low C mild steel. In addition, the perforation life time of the developed steel is about twice longer than that of the mild steel, according to a cyclic corrosion test conducted on automotive underbody parts. Its excellent resistance to perforation corrosion was considered to be achieved by the formation of a protective rust layer of amorphous species, judging from the results of rust analysis by EMPA, FT-IR and laser Raman spectrometer.
1990-08-01