Study of an alternative phosphate sealer for replacement of hexavalent chromium

Banczek, E.P.; Terada, Maysa; Rodrigues, Paulo Rogério Pinto; Costa, Isolda

doi:10.1016/j.surfcoat.2010.09.053

Cited by 14 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…applied the organosilane bis‐1,2‐(triethoxysilyl)ethane to sealing a 2024‐T3 aluminium alloy, which had previously been coated by zinc phosphate. Banzeck et al . used a treatment with niobium ammonium oxalate to passivate of the pores of carbon steel (SAE 1010) after being phosphated in a zinc phosphating bath.…”

Section: Introductionmentioning

confidence: 99%

Black wattle tannin as a zinc phosphating coating sealer

Peres

Cassel

Ferreira

et al. 2013

Surface & Interface Analysis

View full text Add to dashboard Cite

This paper reports an investigation into the use of condensed black wattle tannin as an environmental friendly sealer after zinc phosphating of carbon steel. In order to verify the sealer efficiency against corrosion, electrochemical impedance spectroscopy, potentiodynamic polarisation and salt spray tests were performed. To verify the pore modifications and phase compositions, SEM, electron dispersive spectroscopy and X‐ray diffraction analysis were carried out. The influence of the sealer on the adherence of finishing coatings was analysed. The results show that the tannin/sealer did not affect the final coating adhesion and improved the corrosion resistance of sealed samples. Copyright © 2013 John Wiley & Sons, Ltd.

show abstract

Section: Introductionmentioning

confidence: 99%

Black wattle tannin as a zinc phosphating coating sealer

Peres

Cassel

Ferreira

et al. 2013

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…The presence of the crystals on the material surface broadens the potential applications of the coating. Phosphating baths form crystals on the surface, with different morphologies depending on the formed phosphate, which serve as an anchorage site for further treatments (Banczek et al , 2010). Banczek et al (2009) found needle-like structures when studying phosphating baths with zinc.…”

Section: Resultsmentioning

confidence: 99%

“…Phosphating is one of the surface treatments most commonly used by the industry to protect metallic materials against corrosion, but the process generates toxic waste that is difficult to treat. The toxicity is related to the addition of nickel in the phosphating bath and the use of hexavalent chromium as sealer (Banczek et al , 2010).…”

Section: Introductionmentioning

confidence: 99%

Niobium- and titanium-based coating for the protection of carbon steel SAE 1020 against corrosion

Helleis

Maia

Castro

et al. 2022

ACMM

View full text Add to dashboard Cite

Purpose The purpose of this paper is to evaluate the protection against corrosion of carbon steel SAE 1020 promoted by a niobium- and titanium-based coating produced from a resin obtained by the Pechini method. Design/methodology/approach A resin was prepared with ammonium niobium oxalate as niobium precursor and K2TiF6 as titanium precursor. Carbon Steel SAE 1020 plates were dip coated in the resin and calcinated for 1 h at 600 ºC. Scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction were used to characterize the coating morphologically and structurally. Open circuit potential, electrochemical impedance spectroscopy, anodic potentiodynamic polarization and scanning vibrating electrode technique were used to evaluate the corrosion protection of the coating. Findings The electrochemical analyses evidence slight protection against corrosion of the coating by itself; however, the needle-like crystal structure obtained may potentially provide a good anchorage site, suggesting the coating could be used as a pretreatment that may present similar application to phosphating processes, generating lower environmental impacts. Originality/value Due to increasingly restrictive environmental laws, new environmentally friendlier surface treatments must be researched. This paper approaches this matter using a combination of niobium- and titanium-based coating, produced by a cleaner process, the Pechini method.

show abstract

“…The ZPH sample (Figure 2e) presents a uniform phosphated coating formed by irregular lamellar crystals. According to Banczek et al and Moore et al [19][20] , the morphology observed in the phosphate sample is common due to the formation of hopeite, which consists of hydrated zinc phosphate (Zn 3 (PO 4 ) 2 . 2H 2 O) [19][20] .…”

Section: Resultsmentioning

confidence: 99%