Abstract
Phase identifications of a large number of field exposed sheltered zinc panels have revealed the presence of a number of different corrosion products on zinc. A few of these phases, Zn 4SO 4(OH) 6 · nH 2O, Zn 5(OH) 8Cl 2 · H 2O, NaZn 4Cl(OH) 6SO 4 · 6H 2O and Zn 4Cl 2(OH) 4SO 4 · 5H 2O, seems to exist as final corrosion products. In order to study the formation of these phases, a field exposure program was implemented in atmospheres yielding different end products. A multi-analytical approach was used for detailed studies from the initial stages to fully developed corrosion films. The present study aims at describing the formation of zinc chlorohydroxysulfate (Zn 4Cl 2(OH) 4SO 4 · 5H 2O) appearing in urban and industrial atmospheres. It involves the consecutive formation of three phases, namely zinc hydroxycarbonate as the initial phase, zinc hydroxysulfate as the intermediate phase and zinc chlorohydroxysulfate as the final phase.
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