Composition for cleaning a heat transfer system having an aluminum component

摘要

Disclosed herein is a cleaner concentrate comprising: greater than 10 weight percent of a freezing point depressant, 0.5 to 35 weight percent of oxalic acid, and an azole compound, wherein weight percent is based on the total weight of the cleaner concentrate.

主权项

1. A heat transfer system conditioner for use in a heat transfer system that has been pre-treated with a cleaning solution, the heat transfer system conditioner comprising:
a) water; b) a water soluble alkaline metal phosphate; c) one or more azole compounds; and d) optionally, a corrosion inhibitor, scale inhibitor, acid neutralizer, colorant, surfactant, antifoam, stop-leak agent, or combinations thereof; the cleaning solution comprising: a) greater than 15 weight percent of a freezing point depressant based on total weight of the cleaning solution; b) oxalic acid in an amount ranging from about 8 to about 35 weight percent or from about 5 to about 10 weight percent based on total weight of the cleaning solution; and c) an azole compound;
wherein the cleaning solution is a uniform solution; andwherein the solution is stable at about 10° F. to about 55° F.