SURFACE TREATMENT AGENT FOR ALUMINUM HEAT EXCHANGERS AND SURFACE TREATMENT METHOD

摘要

A surface treatment agent for aluminum heat exchangers, which includes a zirconium element, vanadium element, fluorine element, aluminum element and an acrylic polymer, with the concentration of zirconium element in terms of zirconium being 100-100,000 ppm by mass, the concentration of vanadium element in terms of vanadium being 50-100,000 ppm by mass, the fluorine element concentration being 125-125,000 ppm by mass, the concentration of aluminum element in terms of aluminum being 5-10,000 ppm by mass and the concentration of the acrylic polymer being 100-100,000 ppm by mass. The surface treatment agent has a pH of 0.5-3, and suppresses odor generated from an aluminum heat exchanger, and the generation of white rust that deposits on the surface of an aluminum fin.

主权项

1. A surface treatment agent for an aluminum heat exchanger, comprising:
a zirconium element; at least one vanadium element selected from a group consisting of vanadyl sulfate, vanadyl nitrate, and vanadyl phosphate; an acrylic polymer obtainable by polymerizing a monomer including at least one kind selected from a group consisting of acrylic acid, methacrylic acid, and derivatives thereof; an aluminum element; and a fluorine element; wherein
a concentration of the zirconium element is 100 to 100,000 mass ppm in terms of zirconium;a concentration of the vanadium element in terms of vanadium is 50 to 100,000 mass ppm;a concentration of the polymer is 100 to 100,000 mass ppm;a concentration of the aluminum element in terms of aluminum is 5 to 10,000 mass ppm;a concentration of the fluorine element is 125 to 125,000 mass ppm; anda pH is 0.5 to 3.