Communication—Role of Trivalent Chromium on the Anti-Corrosion Properties of a TCP Conversion Coating on Aluminum Alloy 2024-T3

Shruthi, T. K.; Swain, Greg M.

doi:10.1149/2.1301802jes

Cited by 15 publications

(29 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In summary, both EAD and DC techniques enable an uniform film deposition [ 19 , 53 ]. It has been observed that, despite the ZrO 2 coating formation is supposedly favored by the application of low cathodic potential in electro-assisted method, the correct mechanism is probably a combination of both a chemisorption process and the electro-assisted one happening simultaneously.…”

Section: Resultsmentioning

confidence: 99%

Green Nanocoatings Based on the Deposition of Zirconium Oxide: The Role of the Substrate

et al. 2021

View full text Add to dashboard Cite

Herein, the influence of the substrate in the formation of zirconium oxide monolayer, from an aqueous hexafluorozirconic acid solution, by chemical conversion and by electro-assisted deposition, has been approached. The nanoscale dimensions of the ZrO2 film is affected by the substrate nature and roughness. This study evidenced that the mechanism of Zr-EAD is dependent on the potential applied and on the substrate composition, whereas conversion coating is uniquely dependent on the adsorption reaction time. The zirconium oxide based nanofilms were more homogenous in AA2024 substrates if compared to pure Al grade (AA1100). It was justified by the high content of Cu alloying element present in the grain boundaries of the latter. Such intermetallic active sites favor the obtaining of ZrO2 films, as demonstrated by XPS and AFM results. From a mechanistic point of view, the electrochemical reactions take place simultaneously with the conventional chemical conversion process driven by ions diffusion. Such findings will bring new perspectives for the generation of controlled oxide coatings in modified electrodes used, as for example, in the construction of battery cells; in automotive and in aerospace industries, to replace micrometric layers of zinc phosphate by light-weight zirconium oxide nanometric ones. This study is particularly addressed for the reduction of industrial waste by applying green bath solutions without the need of auxiliary compounds and using lightweight ceramic materials.

show abstract

Section: Resultsmentioning

confidence: 99%

Green Nanocoatings Based on the Deposition of Zirconium Oxide: The Role of the Substrate

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Coating technology doped with specific inhibitors combines the advantages of both and has broad application prospects. Tsai et al [78], and Shruthi et al [79], respectively, conducted experiments on the anticorrosion coating technology of aviation aluminum alloy. Marshall et al [80], through finite element simulation, calculated relevant parameters after the coupling of coated aluminum alloy and stainless steel.…”

Section: Research In the Field Of Corrosion Inhibitionmentioning

confidence: 99%

A Review of Research on Galvanic Corrosion of Aluminum Alloys

Zhu¹,

Leng²,

Jin³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

View full text Add to dashboard Cite

When aluminum alloys are coupled with dissimilar materials, they often act as corrosion anodes and are suscepted to accelerated corrosion. Therefore, deepening our knowledge of such corrosion phenomena, related mechanisms, and elaborating new prediction model is of great theoretical and practical significance. In this paper, such mechanisms are explained from both macroscopic and microscopic points of view by considering several aspects such as the second phase particle type, grain size, and environmental ions. More specifically, different perspectives on such a problem are elaborated, which take into account: the properties of the coupling pair materials, geometrical characteristics, environmental media characteristics, the corrosion regularity of different types of aluminum alloys, the influence of area ratio on anode corrosion current density, the interference of the solution primary ions represented by Cl-and the accompanying ions represented by Al 3+ . A review is also conducted of the standard test methods used in the study of aluminum alloys galvanic corrosion and of research methods such as the Wire Beam Electrodes Technology (WBE), the Scanning Kelvin Probe Force Microscopy (SKPFM) technology. Finally, three kinds of inhibition technologies are discussed, including the anodic oxidation treatment, the corrosion inhibitor treatment and the coating protection method.

show abstract

“…2630) Shruthi and Swain evaluated the effect of trivalent chromium treatment on the oxygen reduction reaction rate on AA2024-T3. 26) They reported that the oxygen reduction reaction on the Cu-rich IMPs was extremely suppressed by the treatment. For Al alloys, Zrbased conversion treatments have been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Chemical Conversion Treatment of AA5083 Aluminum Alloy and AISI 1045 Carbon Steel under Galvanically Coupled Condition in Na<sub>2</sub>MoO<sub>4</sub>: Effect of pH on Corrosion Resistance

et al. 2023

View full text Add to dashboard Cite

To ascertain the effect of solution pH of Na 2 MoO 4 chemical conversion treatment for aluminum/steel joints on corrosion resistance, AA5083 aluminum alloy and AISI 1045 carbon steel were immersed in 50 mM Na 2 MoO 4 at pH ranges of 812 under galvanically coupled condition. Subsequently, in diluted synthetic seawater, the galvanic corrosion resistance of the AA5083 alloy connected to the AISI 1045 carbon steel was assessed. The number of localized corrosion damages was counted, and AA5083 treated at pH 11 was found to be the better corrosion resistance. The oxygen reduction current on bulk Al 6 (Fe, Mn) decreased with increasing solution pH of the conversion treatment. The Al 6 (Fe, Mn) particles on AA5083 were not preferential cathodes, and alkalization through oxygen reduction would not occur when the treatment was performed above pH 9. Auger electron spectroscopy analysis showed that Mo-accumulation, Fe-removal, and film thickening occurred on the particles of AA5083 treated at pH 11. These factors contributed to the suppression of the cathodic activity of the Al 6 (Fe, Mn) particles, resulting in the improved galvanic corrosion resistance of AA5083.

show abstract

Communication—Role of Trivalent Chromium on the Anti-Corrosion Properties of a TCP Conversion Coating on Aluminum Alloy 2024-T3

Cited by 15 publications

References 22 publications

Green Nanocoatings Based on the Deposition of Zirconium Oxide: The Role of the Substrate

Green Nanocoatings Based on the Deposition of Zirconium Oxide: The Role of the Substrate

A Review of Research on Galvanic Corrosion of Aluminum Alloys

Chemical Conversion Treatment of AA5083 Aluminum Alloy and AISI 1045 Carbon Steel under Galvanically Coupled Condition in Na<sub>2</sub>MoO<sub>4</sub>: Effect of pH on Corrosion Resistance

Contact Info

Product

Resources

About