Characterization of atmospheric corrosion products formed on silver in tropical-mountain environments

The influence of the constituent elements on the corrosion mechanisms of silver alloys in sulphide environments: the case of sterling silver

“…Table 2 presents the complex refractive index and the computed thickness of the corrosion lms for the samples immersed until 30 min. The thickness values obtained are higher than those reported for Ag 2 S layer formed in natural environments 49,50 and by articial corrosion.…”

Effects of reduced sulphur atmospheres on reflector materials for concentrating solar thermal applications

“…As stated in [27], the atmospheric corrosion of silver occurs only in the presence of moisture and it rises with increasing relative humidity, although atmospheric corrosion products have been found even at relative humidity values under 70% [28]. Furthermore, many gases and particles are potentially involved in the indoor atmospheric corrosion of silver, being especially sensitive to the presence of H 2 S [27,28,29]. The only significant source of H 2 S is in the gas phase and normally its concentration in the aqueous layers on the silver surface, though very low, reaches equilibrium with the atmosphere according to Henry's law and is sufficient to initiate the formation of corrosion films [27].…”

“…The fundamentals of the thin aqueous layer chemistry of the common engineering metals in humid environments were thoroughly studied by Graedel in various manuscripts [21,27]. As stated in [27], the atmospheric corrosion of silver occurs only in the presence of moisture and it rises with increasing relative humidity, although atmospheric corrosion products have been found even at relative humidity values under 70% [28]. Furthermore, many gases and particles are potentially involved in the indoor atmospheric corrosion of silver, being especially sensitive to the presence of H 2 S [27,28,29].…”

“…Ag 2 S or acanthite is found to be the preeminent silver-containing substance when silver is exposed to H 2 S. If this gas concentration is low and the content of oxidisers (O 3 , NO 2 , Cl 2 ) is significant, Ag 2 O and other silver oxides are likely to be the corrosion products. However, when SO 2 and Clare present, silver sulphates and chlorides may also be formed, taking into account that silver is about an order of magnitude less sensitive to SO 2 than to H 2 S [9,28] and that SO 2 appears to have a negligible influence in silver sulphidation in the case of gas mixtures [7,16]. Both in laboratory and in outdoor environments, nonuniform growth or highly discontinuous nature of Ag 2 S films is characteristic of silver corrosion [18,27].…”

Corrosion Behavior of Silver-Plated Circuit Boards in a Simulated Marine Environment with Industrial Pollution

“…Additionally, due to very thin surface coating, the surface has micro hole defects, and the defects are the corrosion-active sites [ 25 ]. Moreover, SO 2 can induce color change on Ag [ 26 , 27 ]. SO 2 dissolves in the thin electrolyte film to acidize the chemical environment, which aggravates the corrosion degree of the PCB-ImAg.…”