Development of Corrosion Resistant Brazing Sheet for Drawn Cup Type Evaporators Part 2: Application to Evaporator 930149

A highly corrosion resistant drawn cup type evaporator was developed. During the development of this evaporator, the corrosion characteristics of evaporators in the field were examined in detail. Profound understanding of the corrosion mechanism led to the development of a new, unique, corrosion test method which simulates the actual evaporator field service environment.
The main factors involved in increasing the corrosion resistance of the brazing sheet are (1) reduction of iron and silicon content in the core alloy and, (2) addition of titanium to the core alloy. In the present alloy, titanium content varies lamellarly through the thickness of the core alloy. Regions of high titanium content have a more cathodic potential, thus causing corrosion to proceed along the low titanium content lamellae. Consequently, the reduced iron and silicon contents, and the titanium addition, have the net effect of reducing the pitting corrosion rate.
Drawn cup type evaporators fabricated from the new alloy exhibited corrosion lives twice that of evaporators fabricated from a conventional alloy when tested under severe environmental conditions.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Development of Corrosion Resistant Brazing Sheet for Drawn Cup Type Evaporators Part I: Alloy Development


View Details


Silver Alloy Brazing Filler Metal 50Ag - 18Cd - 16.5Zn - 15.5Cu 1160 to 1175 °F (627 to 635 °C) Solidus-Liquidus Range


View Details


Titanium Alloy, Hydraulic, Seamless Tubing 3.0Al - 2.5V Annealed


View Details