The structure of tinplate is usually described as a sequence of layers involving an external tin layer (passivated by a chromate conversion coating), an intermediate FeSn2 layer, and the steel substrate. This structure description applies well to tinplate produced in the past by hot dipping but not necessarily to modern materials fabricated through tin electrodeposition and subsequent heat treatment. In this work, the chemical composition and the structure of 5 commercial tinplate materials have been investigated using Auger electron spectroscopy, scanning electron microscopy, 3D white light interferometry, and electrochemical chrono‐potentiometry. The study revealed that the intermediate layer consists indeed in a wide interface where tin, steel, and the FeSn2 alloy coexist. Moreover, the thickness of the Sn film varied locally significantly. A new tinplate structure was proposed in order to reliably appraise corrosion relevant features.
Abstract:In this work, a series of mono-and multilayer coatings were considered. They consisted of CrN and Cr prepared by physical vapor deposition with a cathodic arc. The most common steels for molds of plastics were chosen as substrates: X37CrMoV5-1 (SMV3), X2NiCoMo18-8-5 (MARVAL M1), X105CrCoMo18-2 (N690) and X40CrMo15 (X13T6). The samples were made with surface state conditions reproducing the main finishes required for molding of plastics: mirror, electro-eroded, sandblasted and ground finish. The coatings were characterized morphologically and chemically. The corrosion behavior of bare and coated steels was evaluated by electrochemical methods.
This paper presents the outcomes of the CANS project (Conservation of cAns in collectioNS), an interdisciplinary research aiming at proposing conservation strategies for full cans, still retaining their original contents, in museums and collections. The paper includes the results of the condition report, measuring the state of conservation of 150 cans from 5 Swiss collections, the correlation between state of conservation, content and age of the can and the extensive characterization of the cans' materials for a better understanding of the corrosion mechanisms.
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