On the Mechanism of Formation of Conversion Titanium-Containing Coatings

Abrashov, A. A.; Grigoryan, N. S.; Vagramyan, T. A.; Asnis, N. A.

doi:10.3390/coatings10040328

Cited by 12 publications

(8 citation statements)

References 25 publications

(32 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A droplet of a solution containing: CuSO 4 •5H 2 O 82 g/L; NaCl 33 g/L; 0.1 N HCl 13 mL/L was applied to a plate, and the time required for the plate color to change from gray to black was measured [39,40].…”

Section: Determination Of the Coating Protective Capabilitymentioning

confidence: 99%

Regularities of the Formation of a Green Superhydrophobic Protective Coating on an Aluminum Alloy after Surface Modification with Stearic Acid Solutions

Abrashov

Grigoryan

Korshak

et al. 2021

Metals

Self Cite

View full text Add to dashboard Cite

It has been shown that solutions of stearic acid in a dimethyl sulfoxide–water binary mixture allow superhydrophobic protective coatings to be created on an aluminum alloy surface with a minimum impact on the environment. The superhydrophobicity and self-cleaning ability of the coating that we developed have been confirmed by measurements of droplet wetting angles and roll-off angles. These properties appear due to the formation of a multimodal micro-rough surface that mainly consists of aluminum stearate. The coatings formed in this manner have been studied by ellipsometry, XPS, and scanning probe microscopy. Their protective ability has been estimated by the “droplet-express” method and in a salt fog chamber. The protective ability of the coating is determined by the DMSO/H2O ratio, the concentration of stearic acid, and the duration and temperature of modification of the aluminum alloy; it is controlled by a competition between the processes of aluminum stearate formation and hydrolysis. It has been shown that adsorption of stearic acid on an aluminum stearate coating increases its permeability and decreases its protective capability. The results presented in this article are useful for optimizing the conditions of applying green superhydrophobic stearate coatings on aluminum alloys in order to achieve a maximum protective effect.

show abstract

Section: Determination Of the Coating Protective Capabilitymentioning

confidence: 99%

Regularities of the Formation of a Green Superhydrophobic Protective Coating on an Aluminum Alloy after Surface Modification with Stearic Acid Solutions

Abrashov

Grigoryan

Korshak

et al. 2021

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…In order to eliminate this drawback, a small amount of nickel ions was introduced into the solution, which, as is known, have a beneficial effect on the adhesion of conversion coatings (phosphating and etc.) [12,13]. It turned out that in the presence of nickel ions (in the form of NiSO4•6H2O) in the solution of 0.22-1.12 g/l, the coatings formed in them cease to smear, and their deep black color is not disturbed.…”

Section: Determination Of the Molybdenum-containing Coatings Depositing Process Parametersmentioning

confidence: 99%

Development of the Process of Passivation of Zinc Surfaces in Molybdate-Containing Solutions

Aleshina

Abrashov

Grigoryan

et al. 2021

METAL 2021 Conference Proeedings

Self Cite

View full text Add to dashboard Cite

“…In the last decades, numerous studies have been aimed towards the substitution of Cr(VI) based surface conversion treatments for corrosion protection purposes. In particular, hexafluorozirconic acid (H 2 ZrF 6 ) [6][7][8][9][10][11][12][13] and hexafluorotitanic acid (H 2 TiF 6 ) [14][15][16] based treatments, silicon alkoxides derived sol-gel coatings [17][18][19][20], Cr(III) conversion treatments [21][22][23], and lanthanides based conversion coatings [24][25][26] gained prominent attention.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Role of Cerium (III) Addition to a MgAl-LDH Coating on AA6082

Fedel

Zampiccoli

2021

Applied Sciences

View full text Add to dashboard Cite

In this work, Ce doped MgAl-LDHs layers have been developed through an in-situ synthesis method on 6082 aluminum surface. The aim was to gain mechanistic insight into the role of Ce(III) as an active corrosion inhibitor embedded in the LDHs layer. The development of the LDH structure was verified by checking the presence of the characteristic XRD peaks, the platelet morphology (evaluated by SEM-EDXS) and the functional groups (by FTIR-ATR analyses). The same techniques were employed to assess the effect of a prolonged immersion time in 0.1 NaCl on the Ce doped MgAl-LDH coatings. Electrochemical impedance spectroscopy (EIS) was employed to monitor the evolution of the electrochemical properties of the coatings during prolonged immersion in saline solutions. The findings suggest a crystallization/dissolution/precipitation mechanism which implies: (i) the formation of crystalline cerium compounds, such as Ce(OH)3, in the LDH structure during the synthesis; (ii) the dissolution upon exposure to the NaCl solution, thus leading to cerium ions release; (iii) the precipitation of amorphous Ce oxides/hydroxides at the cathodic sites when the metal starts to corrode; (iv), the consequent mitigation of the electrochemical activity of the metal and, thus, the reduction of the extent of corrosion.

show abstract

On the Mechanism of Formation of Conversion Titanium-Containing Coatings

Cited by 12 publications

References 25 publications

Regularities of the Formation of a Green Superhydrophobic Protective Coating on an Aluminum Alloy after Surface Modification with Stearic Acid Solutions

Regularities of the Formation of a Green Superhydrophobic Protective Coating on an Aluminum Alloy after Surface Modification with Stearic Acid Solutions

Development of the Process of Passivation of Zinc Surfaces in Molybdate-Containing Solutions

Insight into the Role of Cerium (III) Addition to a MgAl-LDH Coating on AA6082

Contact Info

Product

Resources

About