Effects of Abrasive Blast Cleaning Media on Non-Ferrous Surfaces

Author: Karmen Milić
Mentors: Filip Rogošić, Senior Lecturer; Ivica Ljubenkov, PhD, Assistant Professor

Department of Conservation-Restoration, Arts Academy of the University of Split (Croatia)
Study programme: Integrated undergraduate and graduate course of study in conservation-restoration
Specialization: Metal (graduated in 2017)

MILIC KarmenAbstract

This paper  presents the effect of abrasive blast cleaning media on surfaces of different metals: aluminium, copper, bronze, brass, zinc, tin, and lead. The aforementioned metals were used in both non-corroded and corroded forms. The corrosion  was conducted in three different water solutions: sodium chloride, hydrochloric acid and sodium metabisulfite. The ensuing corrosion products were chloride and sulphate salts. The used abrasive media were: walnut shell, soda, glass beads, ceramic beads, silica sand, corundum, and steel grit. During the blasting process, the distance and the angle (45°) between the nozzle and the metal surface, and the blasting pressure (1 and 5 bar) were kept constant. The blast cleaned surfaces were than visually inspected with the naked eye and under a digital microscope. The objective of the research was to determine the effect of blast media on the surfaces of non-ferrous metals with respect to the properties of both the abrasive media and the metals, in order to facilitate the selection of the best blasting media to be used in future conservation treatments.

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Short biography

KARMEN MILIĆ was born in Split. She enrolled in the Conservation-Restoration Program of the Arts Academy, Split, in 2012. In September 2017, she gained a master’s degree. The subject of the final year research project was the effect of blast cleaning media on non-ferrous Metal surfaces. She works at Kvinar j.d.o.o,  which is a private conservation-restoration studio.