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EFFECT OF DIFFERENT ARTIFICIAL BODY FLUIDS AND THEIR pH ON CORROSION OF BIOMEDICAL METTALLIC MATERIALS |
MOU Zhan-qi LIANG Cheng-hao (Dalian University of Technology; Dalian 116012) |
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Abstract 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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Received: 25 April 1998
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