【摘要】 采用电化学恒电流线性极化法和原子吸收光谱法测定冠状动脉支架用316L和317L不锈钢在37℃人工模拟血浆T yrode’s溶液中的低腐蚀率。结果表明,电化学恒电流线性极化法和原子吸收光谱法测得316L和317L不锈钢的腐蚀率分别为21×1-0 3、9.8×1-0 3μm/a和0.8×1-0 3、0.6×1-0 3μm/a,其值都远小于0.25μm/a,符合医用级金属标准,并且317L不锈钢的腐蚀率小于316L不锈钢。电化学恒电流线性极化法测得的金属腐蚀率大于原子吸收光谱法所得的结果。原子吸收光谱法测定结果能够准确反映金属材料溶解释放于溶液中的金属离子量。更多还原

【Abstract】 Electrochemical constant current linear polarization and atomic absorption spectroscopy were used to measure the corrosion rate of coronary stents made of 316L and 317L stainless steel in 30℃ Tyrode’s solution.The results indicated that the corrosion rate of 316L and 317L stainless steel was 21×10^-3 μm/a,9.8×10^-3（μm/a） and 0.8×10^-3 μm/a,0.6×10^-3 μm/a,respectively.All corrosion rates were lower than the medical materials corrosion rate criteria,i.e.0.25 μm/a.Moreover the corrosion resistance of 317L stainfess stell was much higher than that of 316L stainless stell.The results from atomic absorption spectroscopy may correctly reflect the quantity of releasing metal ions in the solution.更多还原