ANALYSIS OF CORROSION PRODUCTS FORMED ON COPPER IN CL-2 H2S/N0(2) EXPOSURE/

A joint effort has been undertaken, involving four laboratories and ni ne different analytical techniques, aiming at characterizing corrosion products on copper formed in mixed flowing gas test containing Cl-2, H2S, and NO2. The results and Mnng considerations clearly show that th e identification of different crystalline or noncrystalline phases in the corrosion products only can be performed by a combination of indep endently working analytical techniques. Cuprite, Cu2O, is the dominati ng phase during initial exposure, whereas cuprite together with atacam ite, Cu2Cl(OH)(3), are the most abundant phases after 10 days of expos ure. In addition, the corrosion products contain minor amounts of sulf ide, Cu2S, sulfate, most posjnakite, Cu4SO4(OH)(6) . H2O, and nitrate, most likely as gerhardite, Cu2NO3(OH)(3). A nonstoichiometric cuprous oxide, Cu3O2, has also been detected by several techniques.