SURFACE MODIFICATION OF 316L STAINLESS STEEL BY HIGH CURRENT PULSED ELECTRON BEAM  Part II Corrosion behaviors in the simulated body fluid

Acta Metall Sin

2007, Vol. 42

Issue (1): 71-76 DOI:

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SURFACE MODIFICATION OF 316L STAINLESS STEEL BY HIGH CURRENT PULSED ELECTRON BEAM Part II Corrosion behaviors in the simulated body fluid

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大连理工大学材料学院

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;. SURFACE MODIFICATION OF 316L STAINLESS STEEL BY HIGH CURRENT PULSED ELECTRON BEAM Part II Corrosion behaviors in the simulated body fluid. Acta Metall Sin, 2007, 42(1): 71-76 .

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Abstract Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization procedures were used to investigate the pitting corrosion behaviors in the simulated body fluid of AISI 316L stainless steel treated by high current pulsed electron beam (HCPEB). The results showed that the corrosion resistance of 316L samples was significantly improved after HCPEB treatment, which was demonstrated by the increased polarization resistance (Rp) and decreased interface capacitance. The samples after 5 pulses are prone to pitting due to the existence of remnant MnS inclusions or holes in the crater centers. Comparatively, the sample after 20 pulses of HCPEB treatment shows the best corrosion resistance. Its corrosion current density has been decreased to 1/15 of the initial samples, which can be attributed to the selective surface purification effect and removal of physical damages with increasing number of pulses.

Key words: High current pulsed electron beam Electrochemical impedance spectroscopy (EIS) Polarization curves C

Received: 04 April 2006

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