On the Role of pre-treatment of Aluminum Substrate on Deposition of Cerium Based Conversion Layers and Their Corrosion-Protective Ability

Abstract

We've investigated the effect of preliminary Al substrate treatment on the deposition and corrosionprotection ability of thin, conversion cerium oxide layers formed in solutions containing Ce 3+ and Cu 2+ ions. The cerium oxide layers and their corrosion protection behaviour were investigated by SEM, EDS, XPS, and model polarization E-lg i and It chronoamperometric curves. We report on the structure, morphology, chemical composition and the state of the elements in the conversion layers, as well as the thickness and distribution of the elements up to the "conversion layer"/"aluminium substrate" interphase boundary. The preliminary treatment of the Al substrate, as well as the presence of Cu 2+ , both substantially influence the thickness, composition and protective ability of the formed ceria and alumina mixed conversion layers. All these features are related to changes in the ratio of the formed AlOOH (~Al 2 O 3 .H 2 O), Ce(OH) 3 (~Ce 2 O 3) and Ce(OH) 4 (~CeO 2) on the modified Al surface, which are affected by the preliminary treatment of the Al substrate and presence of Cu 2+ ions in the immersion treatment solution based on Ce 3+ ions.

Binary Additives Enhance Micro Arc Oxidation Coating on 6061Al Alloy with Improved Anti-Corrosion Property

“…On the contrary, the thickness of the coatings increased with the increase in (NaPO 3 ) 6 content when the content of H 3 BO 3 was fixed. It can be noted that (NaPO 3 ) 6 and H 3 BO 3 could be used to modify the coatings in a synergistic manner. electrolyte, the thickness of the coatings varied based on their separate rules as a single additive.…”

“…Furthermore, compared to the solo H 3 BO 3 additive coating, the S5 coating showed an 18% thickness enhancement and a more compact morphology. Therefore, the binary additives could achieve not only thickening with the (NaPO 3 ) 6 additive, but also compacting with the H 3 BO 3 additive. The binary additives could develop thicker and more compact coatings, which demonstrated better protection of the substrate.…”

“…The poor corrosion resistance caused by the active chemical properties of aluminum and its alloys greatly restricts their operation life and further applications [2]. In order to improve the corrosion properties of aluminum alloys, great efforts were made using different surface modification methods, such as superhydrophobic surfaces [3,4], conversion coatings [5,6], micro arc oxidation (MAO) [7][8][9], anodic oxidation [10,11], and laser cladding [12,13].…”

“…In this paper, (NaPO 3 ) 6 and H 3 BO 3 were simultaneously added into the base electrolyte as binary additives to further improve the thickness, compactness, and corrosion resistance properties of the MAO coatings. The composition of binary additives in the electrolyte was optimized.…”

Effect of co-monomer on the adhesive performance of PP-g-MAH between cast polypropylene film and aluminum foil

“…Chromate conversion coating has been widely used in the surface treatment of Al foil for preparing Al/P film with high corrosion resistance, T-peeling and heat-sealing strengths [5,14,15]. However, hexavalent chromium is highly toxic and may cause severe environmental pollution, and thus many environmentally friendly alternatives have been developed, such as titanium (Ti) [7], molybdate [16,17], zirconium [18] and cerium conversion coatings [19,20]. Xia et al [7] prepared an environmentally friendly Ti conversion coating on the Al foil by a simple method, and the resulted Al/P film showed high peeling strength and corrosion resistance.…”