Abstract
Brazing of stainless steels is commonly carried out using nickel-based brazing fillers, which provide a high corrosion and oxidation resistance of the resulting joints. These brazed stainless steel joints are mostly used for manufacturing of heat exchangers for energy and air conditioning technologies. The joints of the study were produced at temperatures of 1000 °C, 1125 °C and 1150 °C in vacuum furnaces or continuous furnaces. In both cases, the parts interact with process gases like nitrogen within the brazing process, especially during cooling. The amount of nitrogen in the braze metal as well as in the base material was determined by the carrier gas hot extraction technique. The occurring diffusion of nitrogen into the braze metal and the base material causes a shift in the corrosion potentials. In this work, the influence of the nitrogen enrichment on the corrosion behavior was investigated using a capillary microcell. The corrosion measurements were carried out on the braze metal and the base material. The results of samples, brazed with and without the influence of nitrogen, were compared.
Highlights
Brazed stainless steel components such as heat exchangers for energy and air conditioning technology are manufactured millions of times in a wide range of sizes and types
Analysis of the nitrogen enrichment A quantitative determination of the nitrogen enrichment in the braze metal as well as in the base material are possible by means of carrier gas hot extraction technique (CGHE)
The N2 content in the braze metal as well as in the base material was determined by CGHE
Summary
Brazed stainless steel components such as heat exchangers for energy and air conditioning technology are manufactured millions of times in a wide range of sizes and types. It was supposed that nitrogen is able to influence the corrosion properties of stainless steel joints, brazed with nickel-based fillers [8]. Published under licence by IOP Publishing Ltd work, the influence of nitrogen in process atmospheres on the corrosion behavior of brazed stainless steel joints is investigated.
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