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  • Title: [An evaluation on corrosion resistance of magnetic retainers].
    Author: Zhang F, Hu B, Zheng Y.
    Journal: Zhonghua Kou Qiang Yi Xue Za Zhi; 2001 Jul; 36(4):295-7. PubMed ID: 11718015.
    Abstract:
    OBJECTIVE: The present study was to explore the corrosion resistance of three kinds of magnetic retainers which named neodymium-iron-boron magnet and encapsulated in stainless steel. METHODS: Three kinds of magnetic retainers were exposed for 6 months to artificial saliva thermostated at 36.5 degrees C. This study included a electrochemical test as polarization curves and a chemical test as immersion test. RESULTS: In the electrochemical test, current density of the national keeper was 7.015 microA/cm2 and magnet was 0.119 microA/cm2. In the chemical test, corrosion rate of national keeper was 3.67 x 10(-5) mg/cm2.h and magnet was 1.77 x 10(-5) mg/cm2.h. The corrosion resistance of the national magnetic retainer had little difference with the imported ones. CONCLUSION: Transient exposure of stainless steel to artificial saliva environment is likely to significantly increase elemental release. It would affect the useful life span of magnets.
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