Number of the records: 1
Research on effects of bird excrement on metal materials copper and bronze
- 1.
SYSNO ASEP 0501209 Document Type J - Journal Article R&D Document Type O - Ostatní Subsidiary J Ostatní články Title Research on effects of bird excrement on metal materials copper and bronze Author(s) Balogh, K. (CA)
Slížková, Zuzana (UTAM-F) RID, SAI, ORCID
Kreislová, Kateřina (UTAM-F)Number of authors 3 Source Title e-Monumentica
Roč. 5, č. 1 (2017), s. 5-17Number of pages 13 s. Publication form Online - E Language eng - English Country CZ - Czech Republic Keywords corrosion ; bird excrement ; uric acid ; copper ; bronze Subject RIV AL - Art, Architecture, Cultural Heritage OECD category Coating and films R&D Projects LO1219 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Annotation The presented study was aimed at understanding the effects of bird excrement on copper and bronze. The experiment used accelerated aging tests and focused on the impact of specific chemical components of droppings (uric acid, sodium nitrate, potassium dehydrate phosphate, potassium chloride and potassium sulphate). The effects of environmental conditions (relative humidity of 100 %, SO2 pollution) and exposure duration were also studied. Pure copper sheets, copper sheets with a stable patina, as well as bronze sheets were contaminated by corrosive drops and then, after exposition, investigated. The 3D digital microscopy showed the changes in surface colour and texture. Visual evaluation showed that the drops displayed visible changes within four weeks and that there are minimal differences between RH and RH + SO2 exposure. SEM and SEM-EDS showed the change in surface texture and also identified the presence of fungi and dust particles. Overall, bird droppings do promote the corrosion process of metals. A patina can act as a protective layer against corrosion for some time before it begins to deteriorate. A longer study is required to see more developed results. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2019
Number of the records: 1