Influence of drying temperature on the corrosion performance of chromate coatings on galvanized steel

Zhang, X.; Böhm, Sivasambu; Bosch, A. J.; Westing, E.P.M. van; Wit, J.H.W. de

doi:10.1002/maco.200303769

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…The corrosion rate of Zn is high due to the large potential difference between iron substrate and zinc layer . It is well known that chromate coatings are very effective anticorrosives and inhibitors with self‐healing property . However, due to toxicity and carcinogenic effects of chromate coatings, there have been extensive efforts in order to find an appropriate alternative for it .…”

Section: Introductionmentioning

confidence: 99%

Effect of nano‐silica on the corrosion behavior of silicate conversion coatings on hot‐dip galvanized steel

Jamali

Danaee

Zaarei

2014

Materials & Corrosion

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Nano‐silica potassium silicate conversion coating was deposited in different silica ratio on the surface of hot‐dip galvanized (HDG) steel as an anti‐corrosion coating. The ratio of nano‐silica/potassium silicate has been optimized in order to obtain higher corrosion protection. The corrosion behavior of coatings was examined by means of electrochemical impedance spectroscopy, potentiodynamic polarization, and surface techniques. The corrosion resistance was increased with increasing silica ratio of silicate coatings. This can be related to the size of nano‐silica particles and the ability to fill the pores in potassium silicate coating. SEM images in agreement with the electrochemical results indicated that the coating obtained from silica ratio 3 was more homogeneous and without pores. Electrochemical impedance data shows that with increasing immersion time up to 60 s, the charge transfer resistance increased. Energy dispersive X‐ray analysis shows silica ratio increasing in silicate coatings.

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Section: Introductionmentioning

confidence: 99%

Effect of nano‐silica on the corrosion behavior of silicate conversion coatings on hot‐dip galvanized steel

Jamali

Danaee

Zaarei

2014

Materials & Corrosion

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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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“…As there is still excess liquid upon applying the stock solution on the sample's surface, removing an excess solvent is necessary. Variations in drying temperature have been known to influence the corrosion protection properties of coatings due to the potential to form microcracks at high drying temperatures [50]. To investigate the influence of drying temperature on the corrosion properties of the applied HA coating, the dense Mg-Zn-Zr samples were coated with the same stock solution of HA and dried at temperatures of 25 • C, 40 • C, 55 • C, and 100 • C. Similarly, differences in the composition of the initial stock phosphate solution prior to the application of the conversion coating are known to induce variations in the properties of the final coated samples [27,28].…”

Section: Coating Of Dense Samplesmentioning

confidence: 99%

Surface Modification with Phosphate and Hydroxyapatite of Porous Magnesium Scaffolds Fabricated by Binder Jet Additive Manufacturing

et al. 2022

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The presence of porosity within magnesium-based orthopaedic implants is known to be beneficial, promoting cell proliferation and vascularisation. However, the presence of porosity increases the surface area available for corrosion, compounding the issue of high corrosion rates which has long been plaguing magnesium-based materials. This work looks at the influence of hydroxyapatite and phosphate conversion coatings on the corrosion performance of conventionally cast, dense Mg-Zn-Zr alloys and binder jet additive manufactured porous Mg-Zn-Zr scaffolds. The performance of coating on dense Mg-Zn-Zr was found to be more effective than the coating on the porous Mg-Zn-Zr scaffold, with the discrepancies attributed to both the microstructure and geometric influence of the binder jet additive manufactured, porous Mg-Zn-Zr scaffold, which not only increases the rate of hydrogen evolution but also reduces the ability of the hydrogen gas generated within the pore channels to escape to the sample’s surface. This restricts the effectiveness of coating application for porous Mg scaffold. Furthermore, the limited diffusion within the pore channels can also result in differing localized corrosion environments, causing discrepancies between the localised corrosion environment within the pore channels and that at the bulk electrolyte.

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Influence of drying temperature on the corrosion performance of chromate coatings on galvanized steel

Cited by 9 publications

References 17 publications

Effect of nano‐silica on the corrosion behavior of silicate conversion coatings on hot‐dip galvanized steel

Effect of nano‐silica on the corrosion behavior of silicate conversion coatings on hot‐dip galvanized steel

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

Surface Modification with Phosphate and Hydroxyapatite of Porous Magnesium Scaffolds Fabricated by Binder Jet Additive Manufacturing

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