In vitro and in vivo corrosion evaluation of nickel-chromium- and copper-aluminum-based alloys
In vitro and in vivo corrosion evaluation of nickel-chromium- and copper-aluminum-based alloys
复制标题
DOI：
10.1067/mpr.2000.109377
复制
发表时间：
2000-09-01
影响因子：
4.6
通讯作者：
Muench, A
中科院分区：
文献类型：
--
作者：
Benatti, OFM;Miranda, WG;Muench, A
问题陈述。抗腐蚀性差是铜铝合金使用中存在的主要问题。这项体外和体内研究评估了两种铜铝合金(铜铝和铜铝锌)和镍铬合金的腐蚀情况。材料和方法。在体外试验中，标本被浸泡在以下3种腐蚀液中：人工唾液、0.9%氯化钠和1.0%硫化钠。在活体测试中，将样本嵌入全口义齿中，使其中一个表面暴露。这3个测试部位分别是(1)靠近口腔粘膜(部分自洁部位)，(2)暴露在口腔表面(自洁部位)，(3)标本底面通过隧道状穿孔暴露在唾液中(非自洁部位)。无论是体外还是体内试验，镍铬合金几乎没有发生腐蚀。另一方面，两种铜-铝基合金在硫化物溶液中表现出较高的腐蚀性能。这些相同的合金也经历了。体内试验中，非自清洁部位的腐蚀程度较高，而自清洁部位的腐蚀程度较小。结论镍铬合金具有较高的耐腐蚀性。这两种铜铝合金在硫化物溶液中和临床上非自清洁部位都表现出相当大的腐蚀。然而，在自洁场所，这两种合金没有表现出实质性的腐蚀。
Statement of problem. The low resistance to corrosion is the major problem related to the use of copper-aluminum alloys.Purpose. This in vitro and in vivo study evaluated the corrosion of 2 copper-aluminum alloys (Cu-Al and Cu-Al-Zn) compared with a nickel-chromium alloy.Material and methods. For the in vitro test, specimens were immersed in the following 3 corrosion solutions: artificial saliva, 0.9% sodium chloride, and 1.0% sodium sulfide. For the in vivo test, specimens were embedded in complete dentures, so that one surface was left exposed. The 3 testing sites were (1) close to the oral mucosa (partial self-cleaning site), (2) surface exposed to the oral cavity (self-cleaning site), and (3) specimen bottom surface exposed to the saliva by means of a tunnel-shaped perforation (non-self-cleaning sire).Results. Almost no corrosion occurred with the nickel-chromium alloy, fur either the in vitro or in vivo test. On the other hand, the 2 copper-aluminum-based alloys exhibited high corrosion in the sulfide solution. These same alloys also underwent. high corrosion in non-self-cleaning sites for the in vivo test, although minimal attack was observed in self-cleaning sites.Conclusion, The nickel-chromium alloy presented high resistance to corrosion. Both copper-aluminum alloys showed considerable corrosion in the sulfide solution and clinically in the non-self-cleaning site. However, in self-cleaning sites these 2 alloys slid not show substantial corrosion.