Scientific Essay from the year 2003 in the subject Engineering - Civil Engineering, , course: EUROMAT 2003, language: English, abstract: Laser cleaning of polychrome surfaces is currently problematic due to the fact, that laserirradiation can cause damage of the paint layers. A test program was worked out toanalyse the chemical and physical background of these typical pigment blackeningeffects . The analytical methods ESEM, XRD, DTA, FTIR and NMR were used todescribe the reactions of inorganic pigments and organic binding media caused by laserirradiation. The used laser system is commercially available, is currently used for thecleaning of natural stone surfaces and works at a wavelength of 1064 nm. Thediscoloration of pigments and paint layers was documented by colour measurement. Further the measurement of discoloration thresholds of energy density (of pigments andpaint layers) was a main part of the research.
