Method for making corrosion resistance heat exchangers
 A method for producing corrosion resistance heat exchangers having a plurality of aluminum tubular elements and fin members, the method comprising immersing the tubular elements in a bath with passing an electric current so that the surfaces thereof are covered with zinc layers of 0.3 .mu.m or more in thickness; combining the zinc plated tubular elements with fin members covered with a brazing sheet so that a core is provisionally formed; painting the provisional core with a non-corrosive flux; and placing the provisional core in a furnace to braze the fin members to the tubular elements, and also to enable the zinc layers to diffuse over the surfaces of the tubular elements. 
Showa Aluminum Kabushiki Kaisha
C C B B
C25D C25D B23K B23K
inventional inventional inventional inventional
Ichiro Tatsuo Noboru
Iwai Otsuka Yamaguchi