Dataset for the paper: Protective coatings on metals found in scientific-technical collections: the collection of the Spanish National Museum of Science and Technology (MUNCYT)

[EN] This is the experimental dataset used in the paper: Protective coatings on metals found in scientific-technical collections: the collection of the Spanish National Museum of Science and Technology (MUNCYT). This data presents results on the protective properties of different coatings over metals -bare brass and steel- representative of those found in scientific-technical heritage collections. After a previous examination of several objects to characterise the metals and alloys in the collection of the Spanish National Museum of Science and Technology (MUNCYT), an evaluation of protective coatings has been done. Specifically, Paraloid B-44, B-48, B-67, B-72, Incralac, Cosmolloid H80, double layer of B-72+H80 and shellac have been studied to make a first screening in order to select the most promising candidates for each case and determine the most appropriate methodology and key factors for the study. Coatings have been applied on clean metal surfaces and aged up to 336 hours, by cycles of UV light and water condensation at elevated temperatures. Changes in the aspect of the coupons has been assessed by visual examination, optical microscopy and colorimetric measurements. EIS has been used for a quantitative evaluation of the protective properties and FTIR to measure chemical changes of the layers, allowing to follow, understand and compare the behaviour of the different coatings and substrates upon artificial ageing.