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| USE OF P~+-B~+-Mo~+-N~+ MULTIPLE ION IMPLANTATION TO IMPROVE CORROSION RESISTANCE OF 410 STAINLESS STEEL |
| Yu Fuzhou and Li Fugan (Beijing Institute of Chemical Technology) |
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Abstract Multiple ion implantation is used to improve the resistance of 410 stainless steel(SS)to localized corrosion. Potentiodynamic polarization curves show that the passivity of P~+-B~+ implanted 410 SS is better than that of unimplanted 304 SS in 0.1NH_2SO_4 solution at 30℃; the pitting potential(E_h=E_(10)μA/cm~2)of P~+-B~+ implanted 410 SS is about 500mV more noble than that of unimplanted 304 and 316L (urea grade)SS in 1NHAc/NaAc+0.5％/NaCl solution at 30℃. The passivity of P~+-B~+-Mo~+-N~+ implanted 410 SS is better than that of unimplanted 316L(U.G.)and 25Cr-22Ni-2Mo-N SS, and the pitting potential of P~+-B~+-Mo~+-N~+ implanted 410 SS is about 600mV more noble than that of unimplanted 316L (U. G. )and 25Cr-22Ni-2Mo-N SS, both in HAc/NaAc+0.1 NNaCl solution with pH 4 at 30℃. All those results illustrate that the multiple ion implantation improves the passivity and pitting resistance notably. This conclusion is supported by the results of corrosion weight loss test in 0.1NH_2SO_4 solution at 45℃ for72 hours and the results of pitting corrosion test in 0.1N NaCl+0.07％H_2O_2 solution at 20℃ for 24 hours. Both electron diffraction and micromorphology observation demonstrate that surface layers of 410 SS modified by multiple ion implantation are amorphous. Therefore it is thought that notable improvement of corrosion resistance of implanted 410 SS results from amorphous surface layer containing such benificial elements as Cr, Mo, N and so on.
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Received: 25 August 1987
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