添加金屬銀對SUS316L不銹鋼顯微組織及抗菌性質影響

Microstructure and Antibacterial Properties of Ag-modified SUS316L Stainless Steel

洪琦彥(Chi-Yen Hung)

指導教授 ： 唐自 標

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2011年)

摘要

不銹鋼的應用早已深入我們的日常生活，人們對於不銹鋼的喜愛除了它的耐蝕、光潔、易加工性等的多元性質，現在更進一步發展出具有抗菌性質的不銹鋼。本文利用光學顯微鏡(OM)、X光繞射儀、掃描式電子顯微鏡(SEM)、能量散佈分析儀(EDS)與恆電位儀等儀器，針對SUS 316基材、含銀0.02wt.%、0.1wt.%、0.3wt.%、0.5wt.%之不銹鋼進行顯微結構分析和抗蝕性的研究，抗菌測試依據日本JIS Z2801規範。研究結果顯示，合金經過軋延、退火處理，材料之顯微結構主要為沃斯田鐵、少量肥粒鐵、5um以下微細之銀顆粒或銀氧化物與其他鉻、矽等介在物。經由抗菌測試結果發現，銀只需微量添加量0.02wt.%就可產生56.3%之抗菌效果，當添加量達到0.3wt.%以上時，對於大腸桿菌的抗菌率可達到99%以上，此外，經由動態極化曲線掃瞄分析，添加銀之316L不銹鋼，其腐蝕電位Ecorr 值略有降低，由-0.833V316L降為-0.889VAg0.5%，極化阻抗RP值略降，因此腐蝕電流密度Icorr值變大，由1.43μA/cm2 316L增加至2.70μA/cm2 Ag0.5%，這顯示添加銀之316L不銹鋼較未添加銀的原材料容易發生腐蝕。

關鍵字

抗菌不銹鋼 ； 抗菌原理 ； 銀離子

並列摘要

The applications of stainless steels have been widely served for decades in our daily lives. People are fascinated mainly by its excellent properties of corrosion resistance、cleanability、forming and machining ability. Nowadays, people have further desire of expecting stainless steel with the antibacterial property so as to be able to extend its application to the hygienic-concerned areas such as food industries, water supplying systems, and medical facilities.
This study adopted Optical Microscope、X-ray Diffraction、Scanning Electron Microscopy、Energy Dispersive Spectrometer and Potentiostat for analyzing the microstructure and corrosion resistance for various advance-planned SUS 316 stainless steel with addition of silver element of 0.02wt.%、0.1wt.%、0.3wt.%、0.5wt.% accordingly. As to the antibacterial property, it was tested under the specification of JIS Z2801.
The test results showed the alloy matrix is consisted of γ-austenite, δ-ferrite, silver particles or silver oxide and other inclusions like Cr, Si. With a trace amount of silver 0.02wt.% addition the alloy sample obtained a mild bacterial inhibiting rate 56.3%. As the addition level up to 0.3wt.% the antibacterial rate on Esherichia coli can reach almost 99%. Meanwhile, the dynamic polarization curve shows the silver-alloyed stainless steel with a slightly lower of corrosion resistance in comparison with the original stainless steel as the Icorr values have increased from 1.43μA/cm2 316L to 2.70μA/cm2 Ag0.5%.

並列關鍵字

Antibacterial stainless steel ； Antibacterial principle ； Ag+

參考文獻

[2] K.H. Lo, C. H. S., J.K.L. Lai, "Recent developments in stainless steels", Materials Science and Engineering R ,2009, pp. 39-104.

[8] Juan Xiong, Bo-Fan Xu, Hong-Wei Ni, "Antibacterial and Corrosive Properties of Copper Implanted Austenitic Stainless Steel." International Journal of Minerals, Metallurgy and Materials,2009.

[11] Schaeffler, A. L.,"Constitution diagram for stainless steel weld metal." Metal progress ,56(11),1949,pp. 680-688.

[12] J.A. Brooks and A.W. Thompson, “Microstructural development and solidification cracking susceptibility of austenitic stainless steel welds” International Materials Reviews, Vol.36, no.1,1991, pp.16-44.

[13] J. W. Elmer, S. M. Allen and T. W. Eagar,“Microstructure Development during Solidification of Stainless Steel Alloys,”Metallurgical Transactions A, Vol.20A, , Oct. 1989, pp.2117-2131