Synergistic Effect of Phosphate and Calcium-Containing Pigments on the Corrosion Resistance of Galvanized Steel

Pokhmurs'kyi, V. I.; Zin, І. М.; Layon, S. B.; Bilyi, L. М.

doi:10.1023/b:masc.0000010264.27310.9e

Cited by 10 publications

(7 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, chromate pigments are toxic materials that should be replaced by eco-friendly pigments with the same protective ability [17][18][19] . Various pigments such as CS and mixtures thereof, zinc phosphate, and iron oxide proved to be good choices due to their high anticorrosive and non-toxic properties [20][21][22][23] . In a previous publication, the authors reported CS has a better anticorrosive performance than red iron oxide that closely approaches the durability of chromate pigments…”

Section: Introductionmentioning

confidence: 99%

Characterization of Calcium-doped Silica Gel Prepared in an Aqueous Solution

Quang

Park²,

Kim³

et al. 2012

Resources Processing

View full text Add to dashboard Cite

In this study, calcium-doped silica was prepared by modifying sodium silicate-based silica gel in an aqueous solution of Ca(OH)2. Silica gels with less than 1 mm in size with different pH values were treated in Ca(OH)2 solution at concentrations ranging from 2 to 20 g/L and aged at 25, 60, and 90°C for 40 min. The BET surface area of the silica gel decreased while its pore size increased considerably after modification in Ca(OH)2 solution. The pH of 5% calcium-doped silica in water ranged from about 8.5 to 10, depending on the pH of silica gel, the aging temperature, and the concentration of the Ca(OH)2. When the concentration of the Ca(OH)2 solution was 20%, needle-like crystals of calcium silicate hydrate formed over the surface of silica gel.

show abstract

Section: Introductionmentioning

confidence: 99%

Characterization of Calcium-doped Silica Gel Prepared in an Aqueous Solution

Quang

Park²,

Kim³

et al. 2012

Resources Processing

View full text Add to dashboard Cite

show abstract

“…[21][22][23] Various studies have assessed the efficacy of phosphate as a corrosion inhibitor and shown that phosphate primarily offers anodic inhibition via a reaction with anodicly evoleved metal cations to form a protective insoluble precipitate. [24][25][26][27][28][29][30] However, phosphate has been identified as a critical raw materials in the European unions 2020 report; meaning that due to phosphates high demand in many key sectors phosphates are of high economic importance and high supply chain risk. 31 A promising new technology designed to prevent the drawbacks of sparingly soluble salts, which utilizes encapsulated inhibitors species and may rival hexavalent chromate in corrosion protection, is based on "smart-release" corrosion inhibitor pigments.…”

mentioning

confidence: 99%

“…43,44 This result is consistent with many studies, which states that PO 4 3− primarily offers anodic inhibition via the formation of an insoluble Zn 3 (PO 4 ) 2(s) precipitate (K sp = 9 × 10 −33 mol 5 dm −15 ). [25][26][27][28][29][30] Finally, CrO 4 2− released from HT was shown to be highly efficient at slowing rates of cathodic disbondment. In the presence of HT CrO 4 2…”

mentioning

confidence: 99%

Role of Smart-Release Pigments in Preventing Corrosion Driven Cathodic Disbondment of Organically Coated Hot Dip Galvanised Steel

Ansell

Berry

McGettrick

et al. 2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

The role of smart-release corrosion inhibitive pigments in preventing cathodic delamination of organically coated hot-dip galvanised steel is investigated. The pigments consisted of hydrotalcite exchanged with a range of inorganic and organic anionic species and were dispersed in a model PVB coating. A scanning Kelvin probe technique was used to determine cathodic delamination rates, and the inhibition efficiencies obtained for inorganic ions increased in the order CO32-  MoO42-  NO3-  VO43-  WO42-  PO43-  CrO42-. The inhibition efficiencies for organic-based pigments increased in the order triazole <phenylphosphonate <trans-cinnamate <benzoate <salicylate <benzotriazole. The inhibition efficiency afforded by the best performing organic inhibitor, benzotriazole (BTA), rivalled that of HT containing stored chromate anions. Findings are consistent with HT-BTA acting to sequester anions from the underfilm electrolyte, releasing BTA- which subsequently strongly adsorbs on the underfilm metal surface but can also form an insoluble Zn-BTA precipitate at the coating-defect boundary.

show abstract

“…17 The latter corresponds to the fitting of the impedance data to a physicochemical sound equivalent electrical circuit so that the individual contributions to the overall system's performance can be quantified. 8,9,18 However, since corrosion processes are intrinsically non-linear and non-stationary, 19 trustworthy EIS measurements can only be carried out if it is proven that the inhibitor-containing electrochemical system is linear and time-invariant within the timeframe of the measurement. 20 A number of possible solutions have been proposed lately.…”

mentioning

confidence: 99%

A Complementary Electrochemical Approach for Time-Resolved Evaluation of Corrosion Inhibitor Performance

Meeusen¹,

Zardet²,

Homborg³

et al. 2019

J. Electrochem. Soc.

View full text Add to dashboard Cite

In this paper, different macroscopic electrochemical techniques are applied to study the corrosion inhibitor efficiency, protection mechanism and stability of a calcium aluminum polyphosphate silicate hydrate inhibitor on hot-dip galvanized steel in the timedomain. Potentiodynamic polarization (PP) measurements are applied to study the anodic and cathodic mechanistic behavior as well as inhibitor efficiencies at discrete and single times of exposure. Open circuit potential (OCP) with superimposed linear polarization resistance (LPR) measurements are applied as a faster, non-invasive alternative to PP, characterizing the overall performance of the system in terms of the polarization resistance. Electrochemical impedance spectroscopy (EIS) measurements are applied to detail both the overall performance of the system as well as the corrosion inhibition mechanism related to the electrochemical system's physicochemical representation over time. Electrochemical noise (EN) measurement are used to evaluate the inhibition efficiency as a function of exposure time, represented by the electrochemical noise resistance. Odd random phase electrochemical impedance spectroscopy (ORP-EIS) is selected as the electrochemical tool to study the system's instability, by evaluation of the non-linearities and non-stationarities over time. The non-stationarities present in the inhibitor-containing electrochemical system are shown to cause the overall instability of the system and should be taken into account when interpreting results from the different techniques over time.

show abstract

Synergistic Effect of Phosphate and Calcium-Containing Pigments on the Corrosion Resistance of Galvanized Steel

Cited by 10 publications

References 7 publications

Characterization of Calcium-doped Silica Gel Prepared in an Aqueous Solution

Characterization of Calcium-doped Silica Gel Prepared in an Aqueous Solution

Role of Smart-Release Pigments in Preventing Corrosion Driven Cathodic Disbondment of Organically Coated Hot Dip Galvanised Steel

A Complementary Electrochemical Approach for Time-Resolved Evaluation of Corrosion Inhibitor Performance

Contact Info

Product

Resources

About