Shigeto N, Yanagihara T, Murakami S, Hamada T
Department of Prosthetic Dentistry, Hiroshima University, School of Dentistry, Japan.
J Prosthet Dent. 1991 Nov;66(5):607-10. doi: 10.1016/0022-3913(91)90438-3.
Six nickel-chromium (Ni-Cr) alloys joined with two solders were evaluated for degree of corrosion after they were immersed in corrosive solution for 100 days. The corroded surface of the Ni-Cr alloy and the cross section of the soldered joint were observed and the solution of nickel and copper (Cu) ions in each combination was measured. No corrosion was observed in the high-resistant Ni-Cr alloys with high Cr content. Pitting corrosion was seen on low-resistant Ni-Cr alloys, which had less Cr content. In the cross section of the joint, the joint of silver solder became porous by corrosion and the corrosion advanced especially along the interface. Solution of Ni ions was detected in all of the combinations of Ni-Cr alloys and solders with exception of the combination of high-resistant Ni-Cr alloys and gold solder. On the other hand, solution of Cu ions was detected in all of the combinations with silver solder.
对六种用两种焊料连接的镍铬（Ni-Cr）合金在浸入腐蚀性溶液100天后的腐蚀程度进行了评估。观察了Ni-Cr合金的腐蚀表面和焊接接头的横截面，并测量了每种组合中镍和铜（Cu）离子的溶液。在高铬含量的高抗性Ni-Cr合金中未观察到腐蚀。在铬含量较低的低抗性Ni-Cr合金上出现了点蚀。在接头的横截面中，银焊料的接头因腐蚀而变得多孔，腐蚀尤其沿着界面推进。除了高抗性Ni-Cr合金与金焊料的组合外，在所有Ni-Cr合金与焊料的组合中都检测到了镍离子溶液。另一方面，在所有与银焊料的组合中都检测到了铜离子溶液。
