H2020Индивидуална стипендия2016–2018

MOMIC · Migration Of Molecules In Coatings

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2016-09-01 → 2018-08-31
Финансиране от ЕС: 177 599 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Полимерните покрития предпазват металите от корозия чрез освобождаване на антикорозивни частици, чиетото движение в материала се проучва. Разбирането на тези процеси помага за създаването на по-безопасни и екологични алтернативи на токсичните хроматни пигменти.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Migration Of Molecules In Coatings

Polymer coatings, composed of a polymer binder, functional pigments and non-functional fillers provide corrosion protection in three main ways: 1) forming a barrier to corrosive species, 2) blocking ionic transfer between anode and cathode areas on a metal surface, and 3) actively inhibiting corrosion at the metal surface by releasing anticorrosive species. Effective corrosion inhibiting pigments exhibit limited solubility in water minimising leaching and delivering long-term anti-corrosion performance during the entire service-life of the coating. Historically, the most efficient corrosion protective systems involved chromate-based pigments; however there is now a need to identify more environmentally-friendly, non-toxic alternatives. One serious obstacle to designing novel anti-corrosive systems is the limited understanding of the transport phenomena of ionic species (i.e. ions originating from the pigment particles) in polymer coatings [1]. The dominant theory in the literature proposes: (i) that ions can penetrate polymer matrices through conductive pathways formed as a result of environmental degradation; additionally, pigments present in polymer coatings may provide alternative pathways including: (ii) those formed after leaching of pigment particles and (iii) those via the interface of the matrix and filler particles [2,3]. The second mechanism based on pigment leaching has been shown to be important [3] however no strong experimental evidence for other mechanisms has yet been reported. The goal of this project was to explore in more detail these hypotheses with two research approaches (namely ions-out and ions-in). The difference in chromate pigment leaching behavior (ions-out) between model coatings containing: (a) isolated pigment particles, and (b) clustered particles addressed the second and third hypothesis. Likewise, the possibility of ionic transport within the polymer coatings exposed to the solution with chromate ions (ions-in) was investigated using advanced analytical methods and addressed the first hypothesis. [1] S.B. Lyon et al. Prog Org Coat 102 (2017) 2-7 [2] S. Sellaiyan et al. Prog Org Coat 77 (2014) 257-267 [3] A. E. Hughes et al. AIMS Materials Science 2 (2015) 379-391

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Because of high damage caused by corrosion, polymer protective coatings are materials of great importance. There is growing interest to search for high-performance coatings with less toxic anticorrosive additives (pigments) than commonly used chromates. The main obstacle in design of novel systems is the lack of understanding of fundamental transport phenomena of pigments in the coatings. The project MOMIC (Migration Of Molecules In Coatings) aims at investigating the migration mechanism of anticorrosive additives through polymer coatings. Two model systems will be investigated in order to meet this goal, namely isolated particles system, in which the transport phenomena in polymer matrix will be studied and clustered particles system which is a model reflecting commercial coating formulations. In order to evaluate the migration pathways through the coatings two measurement approaches will be employed. The depletion of the pigment particles will be studied with X-ray Computational Tomography (XCT) combined with Scanning Electron Microscopy (SEM)-based sectioning technique. The molecular migration will be followed with a combination of chemical imaging techniques such as Scanning Transmission Electron Microscopy (STEM), (Confocal) Raman and Infrared Spectroscopy.The project will result in establishing the mechanisms for model systems which are envisioned to be applied to characterise transport phenomena in commercial coatings. This will allow to design coatings with functional additives as well as improve their anticorrosive performance.

Оригинален текст от CORDIS (на английски).

Участници

NOURYON CHEMICALS B.V. · ARNHEMКоординаторНидерландия