采用Ringer's溶液,PBS(-)溶液和Hank's溶液,研究了不同模拟体液和pH值对316L不锈钢、Co-Cr合金和Ti-6Al-4V合金生物医学材料耐蚀性能的影响。结果表明,不同模拟体液的侵蚀性是不同的,侵蚀性由强到弱的顺序为Ringer's>PBS(-)>Hank's溶液。RBS(-)和Hank's溶液中的HPO+4~(2-)、H_2PO_4~(2-)和SO_4~(2-)、葡萄糖,对生物材料的腐蚀起到一定的缓蚀作用。pH降低,对316L不锈钢和Co-Cr合金的耐蚀性能有较大的影响,而对Ti-6Al-4V合金影响较小。
The effect of the composition of artificial body fluids and their pH on corrosion behaviour of SUS316L stainless steel, Co-Cr alloy and Ti-6A1-4V alloy was studied in Ringer's, PBS(-) and Hank's solutions. The experimental results indicated that among the three solutions Ringer's solution was the most corro-sive,followed by PBS(-) solution and Hank's solution. It was probably due to the corrosion inhibition of HPO42-, H2PO4-, SO42- ions and glucose contained in PBS(-) or Hank's solution. The decrease in pH of solution significantly increased the corrosion rate and susceptibility to localized corrosion of 316L SS and Co-Cr alloy. However, Ti-6A1-4V alloy exhibited exceptional stability and it only had a slight increase in corrosion rate with decreasing pH.
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