Liquid phase formation of alkyl- and perfluoro-phosphonic acid derived monolayers on magnesium alloy AZ31 and their chemical properties

Ishizaki, Takahiro; Teshima, Katsuya; Masuda, Yoshitake; Sakamoto, Michiru

doi:10.1016/j.jcis.2011.04.039

Cited by 33 publications

(33 citation statements)

References 51 publications

(64 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This peak is very broad and was deconvoluted into two curves centered at 132.9 eV and 134.6 eV, which correspond to P-O-Metal and P=O bonds, respectively [47]. We assumed that the phosphorus forms stable Al-O-P linkages.…”

Section: Xps Analysis Of Aa2024 Coated With Vtms/teos (3v) and Vtms/tmentioning

confidence: 99%

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

Dalmoro

Santos

Baibich

et al. 2015

Progress in Organic Coatings

View full text Add to dashboard Cite

Sol-gel films were prepared using different ratios of two silica precursors, vinyltrimethoxysilane (VTMS) and tetraethylorthosilicate (TEOS), targeting the anticorrosion treatment of aluminum alloy 2024-T3. The electrochemical behavior of the alloy coated with such films, which was studied in a 0.05 mol L -1 NaCl solution, revealed that the VTMS/TEOS ratio drastically affects the anticorrosion performance. Electrochemical impedance spectroscopy (EIS) results provided evidences that the best anticorrosive response occurs with the films prepared from 50% v/v ethanol, 46% v/v water, 3% v/v VTMS and 1% v/v TEOS. Moreover, the effects of the addition of ethylenediamine tetra(methylene phosphonic acid) (EDTPO) to a hybrid sol-gel matrix were examined. The corrosion resistance was considerably improved when the concentration of added phosphonic acid was 3.7510 -5 mol·L -1 . Scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy analyses revealed that EDTPO-containing films provide a more uniform coverage. Results evidenced the formation of Si-O-Al linkages in the VTMS/TEOS and VTMS/TEOS/EDTPO systems and that the VTMS/TEOS/EDTPO system contained P-O-Al linkages. The P-O-Al bonds, combined with the silica network action, may be responsible for the good anticorrosive behavior of the VTMS/TEOS/EDTPO films.

show abstract

Section: Xps Analysis Of Aa2024 Coated With Vtms/teos (3v) and Vtms/tmentioning

confidence: 99%

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

Dalmoro

Santos

Baibich

et al. 2015

Progress in Organic Coatings

View full text Add to dashboard Cite

show abstract

“…The water contact angles measured on the AZ91D alloy modified with phosphonate SAM indicate a high hydrophobicity of the formed SAM, which is the result of several factors, including the well-ordered and densely packed monolayers, the hydrophobic terminal methyl group oriented outward, and a van der Waals interaction between alkyl chains. The water contact angle of DDPA on the magnesium AZ91D alloy (106 • ) is almost identical to that of DDPA (105 • ) on the magnesium AZ31 alloy [36].…”

Section: Optimization Of the Pretreatment Parameters For The Formatiomentioning

confidence: 73%

“…The fitting of a P 2p peak was conducted with two doublets, 2p1/2 and 2p3/2 components of the energy splitting of 0.88 eV, and intensity ratio of 0.5. The first doublet of 131.1 eV is attributed to the metal bonded to phosphonate oxygen (P-O-M) [36], and the second, at 133.7 eV, is attributed to the From the impedance response showed in Figures 1 and 2, it is clear that the optimal parameters for obtaining the most corrosion-resistant DDPA pretreatment layer in chloride electrolyte solution are a DDPA solution concentration of 0.7 mmol·dm −3 and self-assembling time of 1 h.…”

Section: Optimization Of the Pretreatment Parameters For The Formatiomentioning

confidence: 99%

“…The fitting of a P 2p peak was conducted with two doublets, 2p 1/2 and 2p 3/2 components of the energy splitting of 0.88 eV, and intensity ratio of 0.5. The first doublet of 131.1 eV is attributed to the metal bonded to phosphonate oxygen (P-O-M) [36], and the second, at 133.7 eV, is attributed to the O=P-OH group bonded to the metal surface [36,37]. The O 1s emission peaks were deconvoluted using four Voight curves with BEs of 530.9 eV, 531.8 eV, 532.9 eV, and 533.9 eV, which can be attributed to the oxide ions (O 2− ), mainly MgO [34,38,39], phosphonate oxygen bonded to the metal (P-O-M) [30,[37][38][39][40][41], P-OH group [38][39][40]42], and P=O group [39,40].…”

Section: Optimization Of the Pretreatment Parameters For The Formatiomentioning

confidence: 99%

See 1 more Smart Citation

Effective and Environmentally Friendly Nickel Coating on the Magnesium Alloy

Rončević

Buzuk

Vladislavić

2016

Metals

View full text Add to dashboard Cite

Abstract:The low density and good mechanical properties make magnesium and its alloys attractive construction materials in the electronics, automotive, and aerospace industry, together with application in medicine due to their biocompatibility. Magnesium AZ91D alloy is an alloy with a high content of aluminum, whose mechanical properties overshadow the low corrosion resistance caused by the composition of the alloy and the existence of two phases: α magnesium matrix and β magnesium aluminum intermetallic compound. To improve the corrosion resistance, it is necessary to find an effective protection method for the alloy surface. Knowing and predicting electrochemical processes is an essential for the design and optimization of protective coatings on magnesium and its alloys. In this work, the formations of nickel protective coatings on the magnesium AZ91D alloy surface by electrodeposition and chemical deposition, are presented. For this purpose, environmentally friendly electrolytes were used. The corrosion resistance of the protected alloy was determined in chloride medium using appropriate electrochemical techniques. Characterization of the surface was performed with highly sophisticated surface-analytical methods.

show abstract

“…Apparently, the SAMs of alkyl-or perfluoroalkylphosphonic acids on the AZ 31 alloy (mass%: 2.98 Al, 0.88 Zn, 0.38 Mn, 0.0135 Si, 0.001 Cu, 0.002 Ni, 0.0027 Fe, the rest Mg) were obtained for the first time by immersing the samples in ethanol solution of the reagent for 1-72 h [65]. The anticorrosive and chemical properties of such SAMs were characterized using static  and dynamic  a and  r measurements, XPS, AFM and electrochemical measurements.…”

Section: Mono-and Diphosphonic Acids and Their Saltsmentioning

confidence: 99%

Organic corrosion inhibitors: where are we now? A review. Part IV. Passivation and the role of mono- and diphosphonates

Kuznetsov¹

2017

Int. J. Corros. Scale Inhib.

View full text Add to dashboard Cite

This article continues the review of studies (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016) dealing with the passivation of various metals by solutions of organic corrosion inhibitors. It provides an overview of papers on the passivating properties of mono-and diphosphonic acids and their salts. The results of corrosion and electrochemical studies, as well as studies on the composition and structural features of surface layers on metals by a variety of physicochemical methods are considered.

show abstract

Liquid phase formation of alkyl- and perfluoro-phosphonic acid derived monolayers on magnesium alloy AZ31 and their chemical properties

Cited by 33 publications

References 51 publications

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

Effective and Environmentally Friendly Nickel Coating on the Magnesium Alloy

Organic corrosion inhibitors: where are we now? A review. Part IV. Passivation and the role of mono- and diphosphonates

Contact Info

Product

Resources

About