Abstract
<p class="AMSmaintext"><span lang="EN-GB">The corrosion resistance was studied electrochemically for an iron-based brazing filler metal F300 and a Ni-based brazing filler metal Ni613. Both austenitic stainless steel SUS316 and ferritic stainless steel SUS444 were used as base metals for these brazing filling metals. F300 showed a higher corrosion rate than those of Ni613 and both base metals and was less corrosion-resistive. While Ni613 showed a stronger depression effect of an anodic reaction than those of base metals, F300 showed little depression effect of the reaction. As an Fe-Ni phase dissolved preferentially in F300 and a finite laminated corrosive morphology was observed, the corrosion progression along a depth direction was suggested. These corrosion behaviors depend on the difference of chemical composition of these brazing filler metals.</span></p>
Highlights
One of the brazing filler metals suitable for high temperature brazing would be a nickel-based brazing filler metal
Polarization curves were measured for a Ni-base brazing filling metal and Fe-based one when they were brazed to an austenitic stainless steel SUS316 or a ferritic stainless steel SUS444
Considering the base metal as a standard, an increase in the corrosion potential and a decrease in the corrosion rate make a slope of the line steeper and a rapid increase in the current density is suppressed, causing suppression of an anodic reaction
Summary
One of the brazing filler metals suitable for high temperature brazing would be a nickel-based brazing filler metal. Because of its excellent high-temperature strength and high corrosion or oxidation resistance of a brazed connection [1], it has been used in the production processes for EGR coolers, oil coolers or heat exchangers. A Fe-based brazing filling metal is thought to have the same characteristics as a Ni-based one and excellence in strength or corrosion resistance is expected. Polarization curves were measured for a Ni-base brazing filling metal and Fe-based one when they were brazed to an austenitic stainless steel SUS316 or a ferritic stainless steel SUS444. These stainless steels are mainly used as base metals for current stainless steel products assembled using the brazing process. Corrosion morphology was evaluated by surficial and crosssectional SEM images before and after the test
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