Protective Coatings for Metals in Scientific—Technical Heritage: The Collection of the Spanish National Museum of Science and Technology (MUNCYT)

This paper presents results on the protective properties of different coatings over metals representative those found in scientific–technical heritage collections. An examination several objects collection Spanish National Museum Science and Technology have allowed identification brass steel as most metals, existence (mainly shellac acrylic resins) applied for aesthetic and/or conservation purposes. Based these findings, coupons coated with Paraloid B-44, B-48, B-67, B-72, Incralac, Cosmolloid H80, B-72 + H80 double layer been studied to carry out a first screening order select promising candidates determine appropriate methodology key factors study. Coatings aged up 336 h using cycles UV light water condensation. The change aspect has assessed via visual examination, optical microscopy colorimetric measurements, B-44 Incralac showing least change. EIS used quantitative evaluation FTIR measure chemical changes experienced by some coatings, such B-48 B-67. These evaluations us follow, understand compare behaviour substrates after artificial ageing.