Abstract
The complex corrosion mechanisms for pressurized aqueous solutions in contact with various aerosol containers were studied electrochemically. A pressurized corrosion cell consisting of an aerosol container serving as the working electrode, a platinum rod serving as a hybrid reference-counter electrode, and the pressurized liquids as the electrolyte was designed and fabricated. The correlation of the results between two accelerated electrochemical corrosion tests, namely the galvanostatic polarization test and a 24-hour accelerated constant polarization potential test, and a 10-week storage test, was excellent. It was found that the addition of 0.1%disodium phosphate (DSP) to the aqueous solutions pressurized with a 10% isobutane-propane propellent blend changed the color of the systems to colorless, produced an electrodeposition of colloidal particles, and shifted the site of the crevice corrosion from the bulk-stagnant interface towards the stagnant area. Three distinct and characteristic zones of the polarization potential responses were observed during the anodic galvanostatic polarization measurements, and their mechanisms are discussed.
MEMBRANES FOR ULTRAFILTRATION, OF GRADUATED FINENESS DOWN TO MOLECULAR SIEVES
