In the atmospheric corrosion of metals, the adsorption of water affects the corrosion rates and, hence, the knowledge of water adsorption and metal oxyhydroxide formation is important in understanding the atmospheric corrosion process. Since gold does not form surface oxides and therefore retains its surface characteristics throughout adsorption experiments, it provides a model system. The purposes of the present research were (i) to measure the adsorption of water on gold as a function of relative humidity (RH) and temperature and (ii) to assess the Brunauer-Emmett-Teller (BET) and the Frenkel-Halsey-Hill (FHH) model for water adsorption. In the present research, the quartz-crystal microbalance (QCM) technique was used to measure the mass change of gold at 0 to 100% relative humidity and 7 to 90°C under nitrogen environments. BET and FHH models could not fit the data points with single functional relationships. ΔH°ads values were calculated using a modified BET method and were found to decrease with temperature.
|Original language||English (US)|
|Number of pages||7|
|Journal||Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques|
|State||Published - Nov 1 1997|