Corrosion Processes, Nature and Composition of Corrosion Products on Iron Artefacts of Weaponry

Abstract

This paper analyzed the conditions for the occurrence of cor- rosion processes on historically important weapons and military equipment made of steel during the period in outdoor environment. A considerable attention has been given to the characteristics of the most important corrosion products formed on the steel surface. The formation of akaganite, -FeOOH is a sign of active corrosion under a layer of corrosion products. The conditions that cause the formation and regeneration of hydrochloric and sulphuric acid du- ring the exposure to the elements were analyzed. The most often applied methods of diagnostics and procedures of removing active corrosion anions (desalination) were described as well. The NaOH solution of certain pH values still has the most important applica- tion for the desalination process. The procedures for cleaning the surface before the application of protective coatings and the appli- cation of chemicals that transform rust into stable compounds we- re discussed. As protective coatings, different types of organic co- atings plated on well-prepared steel surfaces were used and so- metimes special types of waxes as well. This paper presents the results of the tests of corrosion products taken from the exhibits of weapons and military equipment from the Military Museum in Bel- grade.