CAJ | 학술논문

目的在模拟口腔环境下,研究牙科用铬合金(钴铬合金和镍铬合金)在pH值为7和5的人工唾液中的电化学腐蚀行为.方法用动电位极化曲线法,测定铬合金在pH值为7和5的人工唾液中自腐蚀电位、自腐蚀电流密度,与含钛元素镍铬合金进行比较分析;并用电化学阻抗谱研究铬合金的腐蚀机制和耐腐蚀性能.结果钴铬合金的自腐蚀电流密度低于含钛元素镍铬合金和镍铬合金,阻抗值高于含钛元素镍铬合金和镍铬合金;而镍铬合金自腐蚀电流密度高于含钛尢素镍铬合金,阻抗值略低于含钛元素镍铬合金.随pH值下降,合金表面自腐蚀电流密度均升高,阻抗值均降低,但钻铬合金的变化幅度最小.结论钴铬合金的耐腐蚀性能优于镍铬合金和含钛元素镍铬合金:随DH值下降,合金耐腐蚀性能均发生不同程度的下降.
목적 재모의구강배경하,연구아과용락합금(고락합금화얼락합금)재pH치위7화5적인공타액중적전화학부식행위.방법 용동전위겁화곡선법,측정락합금재pH치위7화5적인공타액중자부식전위、자부식전류밀도,여함태원소얼락합금진행비교분석;병용전화학조항보연구락합금적부식궤제화내부식성능.결과 고락합금적자부식전류밀도저우함태원소얼락합금화얼락합금,조항치고우함태원소얼락합금화얼락합금;이얼락합금자부식전류밀도고우함태왕소얼락합금,조항치략저우함태원소얼락합금.수pH치하강,합금표면자부식전류밀도균승고,조항치균강저,단찬락합금적변화폭도최소.결론 고락합금적내부식성능우우얼락합금화함태원소얼락합금:수DH치하강,합금내부식성능균발생불동정도적하강.
Objective To study the effect on the corrosion resistance of Cr alloy in the artificial saliva with different pH value in vitro. Methods Compared to Ti alloy, electrochemical technique was used to measure the electric potential of corrosion (E_(corr)), current density of corrosion (I_(corr))Cr alloy in the artificial saliva with different pH value. The corrosion and corrosion resistance mechanism on Cr alloy in the artificial saliva with different pH value had been investigated by the EIS curves. Results The corrosion resistance of Co-Cr alloy was better than Ti alloy. The value of I_(corr) was lower and the value of R_p, was larger than Ti alloy. The corrosion resistance of Ni-Cr alloy was worse than Ti alloy. The value of I_(corr) was larger and the value of R_p was lower than Ti alloy. The pH value in the artificial saliva was decreased, the I_(corr) value of three types of alloy increased, the R_p, value of three types of alloy decreased. But the changes of Co -Cr alloy was smaller than that of Ti alloy or Ni -Cr alloy. Conclusion The corrosion resistance of Co-Cr alloy was superior to that of Ni-Cr alloy and Ti alloy. In the acid artificial saliva, the corrosion resistance of three types of alloy descended evidently.