The Effect of pH on Zinc Phosphate Coating Morphology and its Corrosion Resistance on Mild Steel

Abdalla, Khalid; Rahmat, Azmi; Aziz, Azizan

doi:10.4028/www.scientific.net/amr.626.569

Cited by 15 publications

(7 citation statements)

References 13 publications

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“…It is known, that mechanism of phosphate and polyphosphate protection implies a potential shift of the protected metal to more positive values via formation of passivating films of variable composition [13][14][15][16][17][18] and few micrometers thick [1,6]. No data have been found in the literature regarding the use of STPP as a phosphate-based electrolyte for anticorrosion coat formation nor any information regarding coat structure and properties.…”

Section: Literature Review and Problem Statementmentioning

confidence: 97%

Research of the mechanism of formation and properties of tripolyphosphate coating on the steel basis

Vlasova

Кovalenko

Kotok

et al. 2016

EEJET

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During the manufacturing process, the corrosion protection of metal goods is achieved with the use of an aqueous solution of contact inhibitors of atmospheric corrosion that form a passivating layer on the metal surface. Nitrites, chromates, silicate and phosphates are amongst the most common water-soluble inhibitors. Pipe plants use soda-nitrite, trisodiumphosphate and chromium-containing solu- Досліджений механізм формуван-ня, захисні властивості, мікрострук-тура, фазовий склад триполіфосфат-них покриттів на сталі. Покриття наносили в потенциодинамічному та потенціостатичному режимах в вод-ному розчині натрію триполіфосфа-ту. Запропонований електрохімічний ступінчастий механізм формування триполіфосфатного покриття. Вста-новлено, що покриття з високими захисними властивостями формуєть-ся в умовах повної пасивації при потен-ціодинамічному режимі та склада-ється з двох шарів: перший -тонкий, щільний шар, що містить кристаліч-ну фазу фосфатної природи, і другий -товстий гідрофільний шар, здатний до висихання Ключові слова: натрію триполі-фосфат, анодна крива, пасиваційне покриття, захисні властивості, меха-нізм формування Исследован механизм формирова-ния, защитные свойств, микрострук-тура, фазовый состав триполифос-фатных покрытий на стали. Покрытия наносили в потенциодинамическом и потенциостатическом режимах в вод-ном растворе триполифосфата нат-рия. Предложен электрохимический ступенчатый механизм формирова-ния триполифосфатного покрытия. Установлено, что покрытие с высо-кими защитными свойствами форми-руется в условиях полной пассивации при потенциодинамическом режиме и состоит из двух слоев: первый -тон-кий, плотный слой, содержащий кри-сталлическую фазу фосфатной приро-ды, и второй -толстый гидрофильный слой, способный к высыханию Ключевые слова: триполифосфат натрия, анодная кривая, пассиваци-онное покрытие, защитные свойства, механизм формирования UDC 620.197.3 MATERIALS SCIENCE RESEARCH OF THE

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Section: Literature Review and Problem Statementmentioning

confidence: 97%

Research of the mechanism of formation and properties of tripolyphosphate coating on the steel basis

Vlasova

Кovalenko

Kotok

et al. 2016

EEJET

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“…The quality of the base metal, the method of surface pretreatment, and the technological and operational conditions of the phosphating process (composition of baths, addition of metals to the modified phosphating bath, temperature, treatment time, pH, acceleration, etc.) influence the formation and structure of the phosphate layer [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure and Properties of Zinc Phosphate Layers on Aluminum and Steel Alloy Surfaces

et al. 2023

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Many studies have been carried out on the phosphating of steel and aluminum alloys used in automotive engineering, but characterization of the properties of the phosphate layers formed by the co-phosphating of these alloys in the presence of different base metals is still lacking. In this study, the crystal structure and properties of the phosphate conversion layers formed on the surface of the aluminum alloys important in vehicle manufacturing (cast and forged AlSi1MgMn, and AA6014 panel) and the CRS SAE 1008/1010 reference steel plate by co-deposition prior to painting were investigated. On a process line set up for the phosphating of typical iron and steel alloys, the phosphate coating was formed using nitrite and nitroguanidine accelerators under identical technological parameters. The microstructure of the formed phosphate layers was examined using scanning electron microscopy (SEM), its phase composition using X-ray diffraction (XRD), and its elemental composition using energy-dispersive X-ray analysis (EDX). The suggested main crystalline phase (Zn2.3(Ni0.1Mn0.6)(PO4)2·4H2O) in the surface phosphate layer of both aluminum alloys studied was similar to hopeite, whereas in the steel plate, a minor hopeite phase were identified in addition to the main crystalline phosphophyllite phase (~95%). It can be concluded that, during the combined phosphating treatments, the surfaces of different aluminum and steel alloys behaved similarly to the individual treatments and did not impede the coating reactions of the other metal. To obtain an adequate coating of aluminum and steel alloys, fluoride should always be present in the production line. Comparing the effects of accelerators, we found that the use of nitrite accelerator with the same amount of fluoride resulted in a higher coverage and better quality of the surface protective layer of the aluminum alloys. However, for the steel plate, there was no significant difference between the phosphate coatings prepared with the two different accelerators.

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“…The surface to which such a coating is applied must be suitably prepared -cleaned and for better adhesion it is necessary to create a base conversion phosphate layer. [9][10][11][12] The cataphoretic application of the protective coating is based on the migration and subsequent neutralization of the epoxy-polyurethane or acrylate resin, present in ionic form in aqueous solution, on the cathode -i.e. the coated product.…”

Section: Introductionmentioning

confidence: 99%

The change in the morphology of the blasted surface after phosphating and cataphoretic coating

Brezinová

Guzanová

Draganovská

et al. 2020

Koroze a Ochrana Materialu

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The paper focuses on the quality of coatings applied by cataphoretic deposition and cataphoretic deposition technology with a phosphate layer. The quality of the coatings was evaluated by determining the roughness of the coatings, the morphology of the coatings, spectral analyses were performed detecting the presence of individual elements in the coatings. There was analysed also defect – uncoated spot.

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The Effect of pH on Zinc Phosphate Coating Morphology and its Corrosion Resistance on Mild Steel

Cited by 15 publications

References 13 publications

Research of the mechanism of formation and properties of tripolyphosphate coating on the steel basis

Research of the mechanism of formation and properties of tripolyphosphate coating on the steel basis

Crystal Structure and Properties of Zinc Phosphate Layers on Aluminum and Steel Alloy Surfaces

The change in the morphology of the blasted surface after phosphating and cataphoretic coating

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