Influence of deposition conditions on the microstructure of Al-based coatings for applications as corrosion and anti-permeation barrier

Abstract

The more flexible ECX process has proven to be a promising alternative to ECA

Corrosion barriers processed by Al electroplating and their resistance against flowing Pb–15.7Li

“…Thereby an electrolyte consisting of a commercially available mixture of the ionic liquid 1-ethyl-3-methyl-imidazolium chloride ([Emim]Cl) and aluminum (AlCl 3 ) was used for the Aldeposition, whereas the mixing ratio was 1:1.5. Due to current results reported by Wulf et al [15], pulsed current (pulse plating) was used to improve Al coating properties regarding to the behavior of the coatings during the subsequent heat treatment step. Thereby, the applied mean current density (j m ) was 20 mA/cm 2 and deposition time was 30 min, resulting in a reduced Al coating thickness of about 13 lm compared to the ECA process series.…”

“…3 illustrates the two different HT profiles used for heat treating test samples for corrosion testing described in this study. For this improved HT conditions representative cross sections and EDX line scans of heat-treated Al-coated Eurofer are given by Wulf et al [15,18]. To control Al layer thickness and the diameter of the samples after HT, the diameter was measured by using a Laser scanner.…”

“…This different behavior might come from the improved surface structure of electrodeposited Al coatings achieved by ECX process. Wulf et al showed that the surface structure has a great influence on the uniformity of the Fe-Al scale formed during HT [15]. Therefore, the fine grained, smoother Al coatings produced by ECX should lead to more homogeneous scales compared to ECA, which seems to have an influences on the corrosion behavior.…”

Novel green manufacture of metallic aluminum coatings on carbon steel by sol–gel method

“…[24][25][26] The electroplating aluminum coating on a steel surface is prepared in a non-aqueous molten inorganic or organic salt solution using an external power source. [27][28][29] The usual inorganic molten salt systems containing non-aqueous AlCl 3 require relatively high operation temperatures and the molten corrosive AlCl 3 is easily volatile at high temperatures, which greatly limits the use of substrates and equipment materials. In addition, high electrical energy consumption and low production efficiency also limits the industrial application of electroplating method.…”

Microstructure, mechanical, and corrosion resistance properties of Al0.8CrFeCoNiCux high-entropy alloy coatings on aluminum by laser cladding

“…However, due to poor surface hardness and low wear resistance, its application has been limited in some top-end areas. In recent years, surface treatment, such as electroplating, physical vapor deposition (PVD) and laser cladding (LC) [4][5][6], have been gradually applied for the surface modification of aluminum alloy. Among them, LC has stood out due to its features of less pollution, high efficiency, and the preparation of thicker coatings.…”