DOI: 10.20350/digitalcsic/15113
title: 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)

description: The study was carried out in two parts, the first concerned the characterisation of the objects in the MUNCYT collection. The different metals were characterised with XFR and their original coatings with FTIR. These data can be found in the folder "Characterisation of MUNCYT objects". The second part is about the application and evaluation of the 8 coatings described in the abstract on bare steel and brass coupons. These coatings were exposed to accelerated ageing (condensation and UVA radiation) for a total of 336 hours, with an interruption in the middle of the test. The performance of the coatings was therefore monitored at time 0, time 168 hours and 336 hours. The data of this part can be consulted in the folder "Coatings evaluation", where the subfolders corresponding to each analysis technique used during the different ageing times can be found. All files are in open extensions such as .txt; .dpt and .xlsx and are protected by a Creative Commons Attribution 4.0 International (CC BY 4.0) licence.
description: [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.
description: [ES] Este es el conjunto de datos experimentales utilizado en el artículo: Recubrimientos protectores sobre metales encontrados en colecciones científico-técnicas: la colección del Museo Nacional de Ciencia y Tecnología de España (MUNCYT). Estos datos presentan resultados sobre las propiedades protectoras de diferentes recubrimientos sobre metales -bronce y acero- representativos de los encontrados en colecciones de patrimonio científico-técnico. Tras un examen previo de varios objetos para caracterizar los metales y aleaciones de la colección del Museo Nacional de Ciencia y Tecnología (MUNCYT), se ha realizado una evaluación de los recubrimientos protectores. En concreto, se han estudiado Paraloid B-44, B-48, B-67, B-72, Incralac, Cosmolloid H80, doble capa de B-72+H80 y goma laca para realizar una primera criba con el fin de seleccionar los candidatos más prometedores para cada caso y determinar la metodología y factores clave más adecuados para el estudio. Los recubrimientos se han aplicado sobre superficies metálicas limpias y se han envejecido hasta 336 horas, mediante ciclos de luz UV y condensación de agua a temperaturas elevadas. Los cambios de aspecto de los cupones se han evaluado mediante examen visual, microscopía óptica y mediciones colorimétricas. Se ha utilizado EIS para una evaluación cuantitativa de las propiedades protectoras y FTIR para medir los cambios químicos de las capas, lo que ha permitido seguir, comprender y comparar el comportamiento de los diferentes recubrimientos y sustratos tras el envejecimiento artificial.