Corrosion behavior of zinc chromate coatings

Martyak, Nichölas M.; McCaskie, J. E.; Harrison, L.

doi:10.1016/s0026-0576(96)93872-6

Cited by 19 publications

(12 citation statements)

References 2 publications

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“…Chromate conversion coatings further improve the protection, by enhancing the corrosion resistance, particularly by minimizing the formation of white corrosion products as well as providing a colour finish [2]. Deposition of zinc has been widely investigated using various approaches, which effectively lead to the preparation of coatings that differ in their macro and microstructure, texture, density, uniformity and corrosion resistance [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of zinc electrodeposits from acetate solutions

Sekar

Jayakrishnan

2006

J Appl Electrochem

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This paper deals with zinc plating from an acetate electrolyte and the resultant deposit properties. The addition of thiamine hydrochloride and gelatin to the plating bath improves the corrosion resistance and surface morphology of the zinc deposits. The XRD pattern obtained for electrodeposited zinc show a polycrystalline nature with a hexagonal structure. A uniform and pore free surface was observed under SEM analysis.

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Section: Introductionmentioning

confidence: 99%

Characteristics of zinc electrodeposits from acetate solutions

Sekar

Jayakrishnan

2006

J Appl Electrochem

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“…Then, the total resistance showed a slight decrease but their values were always higher than those corresponding to t = 0. On the other hand, the low impedance values measured at the high frequency range suggest the existence of electrochemical activity in parts of the zinc layer exposed to Na 2 SO 4 solution through defects in the pre-treatment one [18]. This behavior was confirmed by the phase angle evolution towards slightly more capacitive values at the low frequency range, and the displacement of its maximum value towards lower frequencies.…”

Section: Bode Plotsmentioning

confidence: 84%

Behavior of Electrogalvanized Steel Pre-Treated with Cr(III)-Based Baths and Exposed to 0.5 M Na2SO4 Solution

Tomachuk¹,

Elsner

Sarli

2012

Port. Electrochim. Acta

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As Cr (VI) compounds used to formulate conversion layers provide enhanced anticorrosive protection to zinc coatings, but they are produced using hazardous chemicals, the development of "green" technologies is a paramount purpose. Consequently, the corrosion behavior of zinc coatings subjected to a Cr 3+ based passivating treatment, with and without sealing, was studied through EIS measurements in 0.5 M Na 2 SO 4 solution. The analyses of the experimental data allowed inferring that the Cr 3+ -based conversion treatment with an adequate sealer provides good corrosion resistance and, coupled to an adequate painting system, could be a suitable alternative to traditional chromate coatings.

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“…1c depicts that despite having a micro-rough surface and homogenous structure, the ZTRI samples also exhibited the characteristics cracks of chromate layers. According to previous reports [82][83][84] during the drying step of the conversion treatment, the chromium-based layer could shrink due to internal tensile stresses causing micro-cracks or fissures to develop, i.e., make it permeable to the zinc dissolution. This consideration is important because the bare ZHEX and ZTRI samples showed localized corrosion during the exposure to 0.05 M NaCl or 0.1 M SO 4 Na 2 solutions.…”

Section: Conversion Layer Characterizationmentioning

confidence: 98%

Characterization and Corrosion Resistance of Galvanized Steel/Passivation Composite/ Polyurethane Paint Systems

Sarli¹,

Elsner²,

Tomachuk³

2014

BJAST

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The corrosion performance of electrogalvanised steel sheets pre-treated with a Cr 3+ or Cr +6 -based conversion layer and then covered with polyurethane-waterborne topcoat paint has been studied. The pre-treated metallic panels were coated with one of the three tested polyurethane (PU) topcoat paints, in which the dispersion type was the formulation variable. The pigment was TiO 2 (rutile) with a PVC value of 10. Before and after the immersion in 0.05 M NaCl (pH 5.70) or 0.1 M Na 2 SO 4 (pH 6.36) solutions, replicates of the different samples were subjected to standardized tests (porosity, gloss and color, hardness, flexibility). During the immersion, blistering and rusting degrees were evaluated through periodical visual inspections, while the coated steel performance was monitored by Electrochemical Impedance Spectroscopy (EIS) measurements. Initial (dry) and final (wet) paint adhesion was also determined. EIS data were interpreted and discussed in terms of the time dependence of the electrical (paint coating) and electrochemical (steel substrate) parameters associated with interfacial processes describing the metal/paint system deterioration. According to the electrochemical properties, visual inspection and Original Research ArticleBritish Journal of Applied Science & Technology, 4(6): 853-878, 2014 854 standardized tests results, it was concluded that the studied polyurethane-based polymeric films applied on pretreated electrogalvanised steel provided a very effective protection against corrosion as a result of their excellent barrier properties.

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Corrosion behavior of zinc chromate coatings

Cited by 19 publications

References 2 publications

Characteristics of zinc electrodeposits from acetate solutions

Characteristics of zinc electrodeposits from acetate solutions

Behavior of Electrogalvanized Steel Pre-Treated with Cr(III)-Based Baths and Exposed to 0.5 M Na2SO4 Solution

Characterization and Corrosion Resistance of Galvanized Steel/Passivation Composite/ Polyurethane Paint Systems

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