IADR Abstract Archives
Antibacterial property of different fabricated low copper-addition 304 Stainless Steel
Objectives: The aim of this study was to investigate the characteristics of the antibacterial property of copper ion between casted and forged AISI 304 stainless steel incorporated with 0wt% ~ 2.0wt% copper.
Methods: This study adopted the commercial 304 stainless steel (304SS) with the addition of various copper concentration (0, 0.5, 1, 1.5, 2%wt) and casted or forged into rods in 10mm diameter and 120mm length. The rods were heat-treated at 890°C for 1h on solid solution and cut into disc in 10mm diameter. The antibacterial property of the 304SS specimens was investigated by E Coli examination and the detection of the copper ion dissolution by ICP-MS.
Results: With the increasing addition of copper, the amount of copper ion dissolution from 304SS was shown from 0.10ppm to 0.19ppm for forged 304SS and from 0.13ppm to 0.24ppm for casted 304SS. The copper ion dissolution amount was far below the upper limitation of the daily intake amount (10ppm) in human being. Regardless of the fabrication method of copper-addition 304SS, the increase of copper ion dissolution caused a increasing tendency of antibacterial effect. The E. Coli existence was less than 99.9% in 0.5%wt copper-addition 304SS and more less in 2.0% wt copper-addition 304SS.
Conclusions: The copper content of 304SS below 2.0wt% reveals a high copper ion dissolution amount and correlates to the low existence of E.Coli that indicated a strong antibacterial ability of this low copper-added 304SS.
Methods: This study adopted the commercial 304 stainless steel (304SS) with the addition of various copper concentration (0, 0.5, 1, 1.5, 2%wt) and casted or forged into rods in 10mm diameter and 120mm length. The rods were heat-treated at 890°C for 1h on solid solution and cut into disc in 10mm diameter. The antibacterial property of the 304SS specimens was investigated by E Coli examination and the detection of the copper ion dissolution by ICP-MS.
Results: With the increasing addition of copper, the amount of copper ion dissolution from 304SS was shown from 0.10ppm to 0.19ppm for forged 304SS and from 0.13ppm to 0.24ppm for casted 304SS. The copper ion dissolution amount was far below the upper limitation of the daily intake amount (10ppm) in human being. Regardless of the fabrication method of copper-addition 304SS, the increase of copper ion dissolution caused a increasing tendency of antibacterial effect. The E. Coli existence was less than 99.9% in 0.5%wt copper-addition 304SS and more less in 2.0% wt copper-addition 304SS.
Conclusions: The copper content of 304SS below 2.0wt% reveals a high copper ion dissolution amount and correlates to the low existence of E.Coli that indicated a strong antibacterial ability of this low copper-added 304SS.