Formation of subsurface crevices in aluminum alloy 2024-T3 during deposition of cerium-based conversion coatings

Pinc, William R.; Maddela, Surender; O’Keefe, Matthew J.; Fahrenholtz, William G.

doi:10.1016/j.surfcoat.2010.05.039

Cited by 38 publications

(44 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, posttreatments performed in mild conditions should improve the protection characteristics of the film, as it was indicated by those carried out in Ce‐containing solutions without hydrogen peroxide. The beneficial effect of cerium in aluminum alloys has been demonstrated by several authors . They showed that the cerium treatments improved the corrosion resistance of aluminum alloys.…”

Section: Resultsmentioning

confidence: 95%

Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

Machado

Klumpp

Ayusso

et al. 2019

Surface & Interface Analysis

View full text Add to dashboard Cite

In this work, the effect of eight types of surface treatments on the corrosion resistance of friction stir welded samples of an AA2198‐T8 Al‐Cu‐Li alloy were tested and compared in an attempt to find suitable alternatives to toxic and carcinogenic hexavalent chromium treatments. All the samples were anodized and subjected to different post‐anodizing treatments. The post‐anodizing treatments were (1) hydrothermal treatment in Ce (NO3)3 6H2O solution; (2) hydrothermal treatment in Ce (NO3)3 6H2O solution with H2O2; (3) hydrothermal treatment in boiling water; (4) hexavalent chromium conversion coating; and (5) immersion in BTSE (bis‐1,2‐(triethoxysilyl) ethane. The corrosion resistance of the treated samples was evaluated by immersion tests in sodium chloride solution (0.1 mol L−1 NaCl) and electrochemical impedance spectroscopy (EIS) of the friction stir weldment. The results showed that among the alternative treatments, the Ce‐containing solutions presented the best corrosion resistance, especially when used without peroxide.

show abstract

Section: Resultsmentioning

confidence: 95%

Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

Machado

Klumpp

Ayusso

et al. 2019

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…Lack of chloride ions results in a considerable reduction in coating deposition rates and/or coating thicknesses since nitrate ions are not able to break down aluminum oxide layer as effectively as chloride ions 24,66 . This is obvious by comparing the two coatings in Figs.…”

Section: Morphology and Compositionmentioning

confidence: 99%

“…The breakdown of the oxide layer takes place especially at the interface between α-Al phase and the eutectic silicon and/or iron-rich IM particles 64 . This phenomenon can be controversial, since it may also result in the formation of subsurface crevices 24 . However, formation of subsurface crevices usually happens with a combination of NaCl and H2O2 in the solution 11 .…”

Section: Morphology and Compositionmentioning

confidence: 99%

“…Deposition and corrosion properties of CeCC have been studied not only on aluminum alloys but also on other such as magnesium alloys [5][6][7][8] and steel [9][10][11][12] . Most of the research on CeCC on aluminum alloys has been widely focused on protection of high strength alloys with aerospace applications such as AA2024 [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] and AA7075 20,[33][34][35][36][37][38][39][40] . Other studies include AA5083 12,[41][42][43] , AA6061 [44][45][46] , AA6063 47,48 and AA6082 49 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Deposition and Characterization of Cerium-Based Conversion Coating on HPDC Low Si Content Aluminum Alloy

Eslami¹,

Fedel²,

Speranza³

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

Cerium-based conversion coatings were deposited on high pressure die cast (HPDC) Al-Si alloys using an immersion method. Hydrogen peroxide and sodium chloride were added to the conversion solution to accelerate the coating formation and to understand its formation mechanism. These studies showed that the deposition of cerium hydroxide/oxide conversion layer starts from iron-rich intermetallic particles, which are located inside the eutectic region and then the coating growth continues to cover the entire alloy surface. This phenomenon passivates the active interfaces between iron-rich intermetallic particles and/or the eutectic silicon phase and the aluminum matrix, which are prone to localized corrosion in chloride ions containing environments. Accordingly, values of the total impedance in EIS measurements significantly increased for the treated substrates. Morphologies of the conversion coatings and the oxidation state of cerium compounds were found to be dependent on the composition of the solution and the presence of chloride ions and/or hydrogen peroxide. Aluminum alloy with higher silicon content showed a more active surface during immersion in the conversion solution. This makes it more difficult to be treated using aggressive conversion solutions.

show abstract

“…The most widely used techniques include chemical conversion [12][13][14][15][16][17][18] and sol-gel [19][20][21][22] methods. The corrosion-resistant performance of CeOCs on Al alloy substrates strongly depends on the coating structure, thickness and defects.…”

Section: Introductionmentioning

confidence: 99%

Structure and corrosion behavior of sputter deposited cerium oxide based coatings with various thickness on Al 2024-T3 alloy substrates

Liu

Huang

Claypool

et al. 2015

Applied Surface Science

View full text Add to dashboard Cite

Formation of subsurface crevices in aluminum alloy 2024-T3 during deposition of cerium-based conversion coatings

Cited by 38 publications

References 19 publications

Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

Deposition and Characterization of Cerium-Based Conversion Coating on HPDC Low Si Content Aluminum Alloy

Structure and corrosion behavior of sputter deposited cerium oxide based coatings with various thickness on Al 2024-T3 alloy substrates

Contact Info

Product

Resources

About