On a set of quaternary bronze (G85) specimens, single salts (NaCl, NaNO3, Na2SO4, NH4NO3 and (NH4)2SO4) and a mix of them were deposited to evaluate the effects of each salt and to compare the effects of anions and cations. Two deposition methods were tested: dry (directly depositing the salt on the surface) and drop (depositing the salt as water drop and drying it), simulating the initial chemical activation of the salts by RH% variations or by raindrops, respectively. Then, to better simulate the composition of real PM, a mixture containing representative amounts of soluble salts, a mineral, a black carbon and an organic fraction was formulated and spread on the specimens. All the specimens were placed in a climatic chamber and exposed to cyclic variations of T and RH for a total of three weeks.
PM effects on metallic surfaces: development of a new accelerated ageing methodology / Vettori I., Vassura I., Venturini E., Chiavari C., Martini C., Passarini F., Bernardi E.. - ELETTRONICO. - (2018), pp. 0-0. (Intervento presentato al convegno XXVII Congresso della Divisione di Chimica Analitica).
PM effects on metallic surfaces: development of a new accelerated ageing methodology
Vettori I.;
2018
Abstract
On a set of quaternary bronze (G85) specimens, single salts (NaCl, NaNO3, Na2SO4, NH4NO3 and (NH4)2SO4) and a mix of them were deposited to evaluate the effects of each salt and to compare the effects of anions and cations. Two deposition methods were tested: dry (directly depositing the salt on the surface) and drop (depositing the salt as water drop and drying it), simulating the initial chemical activation of the salts by RH% variations or by raindrops, respectively. Then, to better simulate the composition of real PM, a mixture containing representative amounts of soluble salts, a mineral, a black carbon and an organic fraction was formulated and spread on the specimens. All the specimens were placed in a climatic chamber and exposed to cyclic variations of T and RH for a total of three weeks.
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