Air pollution by aluminum compounds resulting from corrosion of air conditioners

Abstract

A1203-3H20), chlorinated aluminum oxide (AUOa-HCl), and carbonated aluminum oxide (Al203-C02) contribute to air pollution as products of the corrosion of air conditioners. In cold rooms at temperatures of 3-6°C, this pollutant precipitates from the air coating all surfaces in the rooms

Examination of Aluminum Corrosion Products in Marine or Industrial Marine Atmosphere

“…In Meeresatmosphare wurden AIZO3 . 3 It is well known that the passivation film on atmospheric corrosion exposed aluminum surface is mainly consisting of hydrated aluminum oxide forming a more or less porous film according to the environment and anions (Cl-, SOT-, SOTetc.) in contact with aluminum.…”

“…This method was not found to be very satisfactory because the filtered residue may contain, in addition to the corrosion products, other products like AlBr3 or All3 which are little soluble in non aqueous environment and might affect the analytical determination of the corrosion products. It is also impossible to separate aluminum corrosion products by mercuriation [3] a method usually adopted to isolate the non-metal phases from the aluminum matrices since amalgamation with Mercury of aluminum does not only dissolve few atomic layers but will deeply etch the metal. In addition to the corrosion products, the residue may therefore also contain the compounds of the non metal phases of the metal in question (mainly Al203) which may alter the results of the corrosion product analysis.…”

“…in contact with aluminum. For instance, aluminum corrosion products in marine atmosphere are not only including yA1203 and AlO(0H) [l] but also oxychlorides [2]; oxysulphates [2] will form in limited quantity in SO2 polluted atmospheres.The presence of oxycarbonates has been determined in non industrial urban environments [3]. The various mixed compounds precipitating along with the aluminum oxides will change the porosity and conductivity of the film and hence affect its protection capacity.…”

“…The presence of oxycarbonates has been determined in non industrial urban environments [3]. The various mixed compounds precipitating along with the aluminum oxides will change the porosity and conductivity of the film and hence affect its protection capacity.…”