Yasushi Nishizaki1 and Kohji Kawahara2
1Chiba Institute of Technology, Narashino
The mechanical properties and corrosion resistance of manganese-base alloys cold-rolled in concentrated and 10% HCl, HNO3, H2SO4, HF and H3PO4, and other acidic solutions were examined.
The maximum tensile strength of 1370 MPa was obtained by the cold-rolled Mn-Cu-C alloys. The strength of the Mn-Cr-Ni-Cu alloys showed an intermediate value, that of the Mn-Cu aloys giving a minimum value. The alloys cold-rolled after heating at 1173 K showed embrittlement. Such embrittlement, however, was prevented in most cases by a presolution-treatment prior to heating at lower temperatures. Addition of copper or nickel or both showed a tendency to suppress the embrittlement or to depress the temperature at which the embrittlement would occur.
In the corrosion test, the chromium element was effective for the attack of acidic solutions, in particular for that of nitric solutions; nickel and copper elements were corrosion resistant for reducing solutions. Most of the manganese-base alloys formed corrosion resisting films in the concentrated H2SO4 solution.
tensile strength, elongation, corrosion resistance, manganese-base alloy, manganese-chromium-nickel-copper alloy, embrittlement
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