Abstract Corrosion products formed on the surface of two silver brazing alloys after the potentiostatic polarization in 3.5% sodium chloride solution were characterized by the standard methods such as, the X-ray diffraction, micro-Raman spectroscopy, and scanning electron microscopy with energy-dispersive spectroscopy. This paper presents the results of a laser desorption/ionization mass spectrometry (LDI MS) analysis as a new approach to the characterization of corrosion products. The potential of the anodic polarization was 0.5 V versus saturated calomel electrode, and the process duration was 300 s. The corrosion layers on both investigated alloys were similar in composition with cuprous chloride and silver chloride as the main components and had strong indications of cuprous oxide formation. The major difference between these two layers was the existence of zinc hydroxychloride as the corrosion product of Ag-Cu-Zn alloy. Palladium compounds were not found in the case of Ag-Cu-Pd alloy. The results of different methods have shown a good consistency. Complementarity between the used methods was useful in the interpretation of the results for each used method. This study has demonstrated that LDI MS can be used as an efficient additional method together with the traditional ones.

中文翻译：

---

表征 Ag60Cu26Zn14 和 Ag58.5Cu31.5Pd10 钎焊合金表面腐蚀产物的补充方法

摘要 采用 X 射线衍射、显微拉曼光谱和能量色散扫描电子显微镜等标准方法对两种银钎料在 3.5% 氯化钠溶液中恒电位极化后形成的腐蚀产物进行了表征。光谱学。本文介绍了激光解吸/电离质谱 (LDI MS) 分析的结果，作为表征腐蚀产物的新方法。相对于饱和甘汞电极，阳极极化电位为 0.5 V，过程持续时间为 300 秒。两种被研究合金上的腐蚀层在成分上相似，以氯化亚铜和氯化银为主要成分，并具有强烈​​的氧化亚铜形成迹象。这两层之间的主要区别是作为Ag-Cu-Zn合金腐蚀产物的羟基氯化锌的存在。在Ag-Cu-Pd合金的情况下没有发现钯化合物。不同方法的结果显示出良好的一致性。所用方法之间的互补性有助于解释每种所用方法的结果。本研究表明，LDI MS 可以与传统方法一起用作一种有效的附加方法。