CLEANING OF OUTER SURFACE OF ALUMINIUM OR ALUMINIUM ALLOYS OF AIR COOLING HARDWARE Russian patent published in 2014 - IPC F28G9/00 B08B3/02 C23G1/12 

FIELD: process engineering.

SUBSTANCE: invention relates to cleaning outer aluminium surfaces of air cooling hardware. Proposed method comprises processing of surface with detergent and flushing with water. Note here that cleaning is conducted in three steps. At first and third steps, surface is flushed with heated water or the mix of water with steam at jet pressure of 20-150 bar. At second step, surface is flushed with 0.25-1.5% water solution of acidic detergent heated to 20-60°C at jet pressure of 20-150 bar and duration of 10-30 minutes. Used detergent comprises the following substances at the following ratio of components in wt %: orthophosphoric acid - 20.0-25.0, nitric acid - 8.0-15.0, oxyethylidenediphosphorus acid - 2.0-4.5, non-ionic surfactant - 0.05-0.11, water making up to 100. At first and third steps, surface is flushed with water heated to 20-100°C or with mix of water with steam heated to 100-155°C.

EFFECT: higher efficiency of cleaning the surfaces located between heat exchanger ribs.

3 cl, 6 ex