Open AccessMonitoring of corrosive environment aggressiveness and development of a sensor for monitoring of the water film in exposure chamber
Author(s) -
Richard Bureš,
P. Rak,
J. Stoulil
Publication year - 2020
Publication title -
koroze a ochrana materiálu
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.228
H-Index - 7
eISSN - 1804-1213
pISSN - 0452-599X
DOI - 10.2478/kom-2020-0003
Subject(s) - atmosphere (unit) , condensation , chloride , materials science , ammonia , environmental science , metallurgy , environmental chemistry , chemistry , meteorology , physics , organic chemistry
Exposure of copper in corrosive environment is possible way, how to obtain artificial patina. Various solutions based on chloride, ammonia or polysulfide are commonly use in this purpose. Furthermore, it appears that the patina is also formed in an environment with an increased concentration of SO 2 in the atmosphere. This procedure was tested in a small (30 l) exposure chamber, where the aggressiveness of the environment was monitored and where the effect of alternating the condensation and drying phases was shown to be positive. Based on this experiment, a 2 m 3 pilot chamber was designed for which a water film sensor was developed and tested to ensure drying of the object surface. Monitoring of the aggressiveness of the environment showed that the pH and SO 2 concentrations in the atmosphere are stable after approximately 5 hours and the ideal input SO 2 concentration is 17.7 g m -3 at which the pH stabilizes at 2.7-3. By recording the voltage variation on the sensor, it was possible to monitor the formation and drying of the water film during the cycling of the condensation and drying phases.