A localized study on the influence of surface preparation on the reactivity of cast Al-7Si-1Fe and Al-7Si-2Cu-1Fe alloys and their effect on cerium conversion coating deposition

Electrochemical corrosion resistance of aluminum alloy 6101 with cerium-based coatings in an alkaline environment

“…Investigation of the conformation of the cerium-based eco-friendly coatings thru EDS and the elemental contents (wt%) showed N (12.49%), O (46.13%), Al (2.49%), Ce (38.09%). Therefore, the-dip coating of aluminum alloy 6101 cerium oxide-based mostly consisted of Ce, O, Al, and N elements ( Sainis and Zanella, 2022 ).…”

“…showed N (12.49%), O (46.13%), Al (2.49%), Ce (38.09%). Therefore, the-dip coating of aluminum alloy 6101 cerium oxide-based mostly consisted of Ce, O, Al, and N elements (Sainis and Zanella, 2022).…”

The influence of cathodic θ-Al2Cu intermetallic geometry on the localized-corrosion-triggered conversion coating deposition

“…In wrought alloys, the θ-phase IM is present as either a fine precipitate of sub-micron size 22,31,40 or as a constituent particle of dimensions of the order of several microns 41 .The θ-phase IM in cast alloys, however, adopt most typically an Al-Al2Cu eutectic morphology and most cast alloys have a mixture of eutectic and blocky morphology 42 . The selective and localized deposition of conversion coating compounds on the cathodic IM sites of the microstructure has been reported on several aluminium alloys containing different cathodic IM containing Cu 11,16,[43][44][45][46] like θ-Al2Cu, ω-Al7Cu2Fe and S-Al2CuMg. This work will however focus only on one type of Cu-rich IM θ-Al2Cu, which has a eutectic structure.…”

“…Cu is typically added to enhance the strength and hardness of aluminium 1 by solution and precipitation hardening While the microstructural heterogeneities benefit the alloy´s mechanical properties, they are detrimental to the corrosion resistance 2 and are the primary cause of localized corrosion in aluminium alloys 3 . Some intermetallic (IM) particles that contain Mg and Si are anodic relative to the matrix 4,5 , several of the other phases containing Cu, Fe or Mn are cathodic [6][7][8][9][10][11] .…”

“…Since the objective was to understand only the influence of the geometric properties of θ-Al2Cu, other parameters like the surface preparation and conversion coating treatment bath chemistry are kept fixed. The choice of these parameters is made based on our previous studies 11,46,48 .…”