On the Effects of Atmospheric Particles Contamination and Humidity on Tin Corrosion

Abstract

Abstract-The effects of hygroscopic atmospheric particles are investigated in relation with corrosion of tin. Surface insulation resistance test boards were directly contaminated both with ambient particles sampled in the field at Milan (Italy) and with pure saline particles generated in the laboratory. An innovative particle deposition device was used to uniformly coat circular spots on to the test board surfaces. Deliquescence and crystallization of the water-soluble compounds were detected by observing the impedance response to varying relative humidity (RH) conditions with a gradual and continuous ramps. The effects of the adsorption/desorption kinetics and of the temperature on the deliquescence and crystallization relative humidity values were also investigated. Leakage current measurements at 5 V DC highlighted the ability of atmospheric particles to promote corrosion and electrochemical migration at RH levels far below condensing conditions (100% RH).

On the Chemical Composition and Hygroscopicity of Aerosols Deposited on the Insulators of Italian Power Lines

“…Even for the glass specimen, a saline mix, prepared according to the ionic composition resulting from the analysis of the deposit on the insulator surface, was deposited Even for the glass specimen, a saline mix, prepared according to the ionic composition resulting from the analysis of the deposit on the insulator surface, was deposited upon the calcium-sodium samples. This saline mix was deposited via a rotating impactor as reported in [32] with an amount of kaolin proportional to the NSDD mass to simulate the presence of the crustal material (black carbon was negligible in the chemical analysis results; Section 3.3).…”

On the Synergy between Elemental Carbon and Inorganic Ions in the Determination of the Electrical Conductance Properties of Deposited Aerosols: Implications for Energy Applications

“…The physical state (wet or dry) of atmospheric aerosols determines their physical-chemical properties responsible for their behavior in various environmental processes, such as atmospheric corrosion and bridging phenomena [1][2][3][4][5], interaction with solar radiation and satellite 2 of 24 applications [6][7][8][9][10][11] as well as heterogeneous reactivity on the aerosol's surface [12]. The critical points of the phase transition of an atmospheric particle are the deliquescence and the crystallization relative humidity (DRH and CRH).…”

“…With respect to this, atmospheric aerosols can penetrate indoor [20,31] and when hydrated, could represent a potential danger for the indoor installed electronic components [32][33][34][35], since they can induce three main effects on electronics [36]. First of all, electrochemical corrosion can occur and the impact of the deposited aerosols can be different if ionic species are in the solid state or are dissolved [1,4,5,37]. In addition, particles deposited on electronics can have mechanical effects, such as heat accumulation on electronic circuitry, or electrical effects.…”