Abstract The corrosion behavior of copper-brazed joints with a ternary filler metal, Cu-P-Ag (74.75% Cu, 7.25% P, 18% Ag) in the form of wire for brazing, was studied in 400 g/L, 700 g/L, 850 g/L, and commercial lithium bromide (LiBr) solution (850 g/L LiBr solution with 4.3 g/L lithium chromate [Li2CrO4] as inhibitor and 0.08 g/L lithium hydroxide [LiOH] as pH control) at 25°C. Corrosion resistance was studied on three different geometrical types of electrodes designed to study copper-brazed joints. Type 1 or filler metal (FM) was tested to study the influence of the alloying elements on the copper corrosion resistance. Type 2 or melted filler metal (MFM) was used to study the thermal effect on the filler metal corrosion behavior. Type 3 Cu//(Cu-P-Ag) or brazed copper was configured to study the brazing method, the melting process on copper, and the galvanic effect on copper-brazed joints. Corrosion resistance was estimated from the polarization curves. Metallographic examination was carried out to chara...