Abstracts Book - IMRC 2018

• SE1-O005
USE OF ALUMINUM ALLOY SERIES 4XXX, TO RETARD THE
CORROSION SPEED IN HEAT EXCHANGERS FOR THE
AUTOMOTIVE INDUSTRY
Luis Santiago Ortiz Monroy 1 , A. Alberto Torres Castillo 2 , Enrique Galarza 1 , Edgar Vega 1
1 Valeo Engine Cooling, Quality Laboratory, Mexico. 2 Universidad Autónoma de San Luis Potosí,
Instituto de Metalurgia, Mexico.
During a warranty claim on heat exchangers used in air conditioning, the client
reports spikes of guarantees due to inter-granular corrosion. The Valeo R & D
department, further analysis was perform to find a reduction to the corrosion
on brazing process. Analysis on brazing Valeo Process confirm a phenomenon
of atomic diffusion of the Si occurs in the alloy of the 4XXX series, this atomic
diffusion forms a micro-structural layer of brown color. This brown layer retards
inter-granular corrosion due to the corrosion takes a longitudinal direction to
the tube and retards the speed in the transverse direction. The use of this band
of brown color (silicon diffusion), minimizes failures by guarantee in field. The
present work describes the method of measurement on the phenomenon of
diffusion of silicon that occurs during the process of brazing in alloys series 4XXX
and the impact to retard failures by intergranular corrosion
Keywords: inter-granular corrosion, brazing process, micro-structural layer
Presenting authors email: luis-santiago.ortiz@valeo.com