Angelini E, Pezzoli M, Rosalbino F, Zucchi F
Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Italy.
J Dent. 1991 Feb;19(1):56-61. doi: 10.1016/0300-5712(91)90041-v.
The influence of corrosion on the bond strength of different brazed joints commonly used in dentistry has been investigated by means of accelerated immersion tests in artificial saliva buffered at pH 2, and in Ringer's solution, both kept at 37 degrees C. Two Co-Cr base metal alloys were brazed with a gold and a non-precious alloy. After 60 days' immersion the tensile strength of the samples brazed with the gold alloy was dramatically reduced because of galvanic corrosion phenomena. The bond strength of the specimens brazed with the non-precious alloy was largely unaffected. Corrosion products rich in nickel were detected. The electrochemical characterization of the base metal alloys and brazing materials was performed by means of polarization curves in the two media investigated. High short circuit currents were only produced with the gold brazing materials.
通过在pH值为2的人工唾液和林格氏溶液中进行加速浸泡试验，研究了腐蚀对牙科常用不同钎焊接头结合强度的影响，两种溶液均保持在37摄氏度。两种钴铬基金属合金分别与一种金合金和一种非贵金属合金进行钎焊。浸泡60天后，由于电偶腐蚀现象，用金合金钎焊的样品的拉伸强度显著降低。用非贵金属合金钎焊的试样的结合强度基本未受影响。检测到富含镍的腐蚀产物。通过在两种研究介质中的极化曲线对基金属合金和钎焊材料进行了电化学表征。仅用金钎焊材料产生了高短路电流。
