Study of Cerium and Lanthanum Conversion Coatings on AZ63 Magnesium Alloy Surface

Lin, Chao; Chen, Changguo; Wang, Ningning; Wang, Jimin; Deng, Liangliang

doi:10.1016/s1875-5372(15)30030-8

Cited by 35 publications

(8 citation statements)

References 11 publications

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“…Such processes vary from the widely used chromate/manganese dip treatment to anodic treatments in fluoride-containing baths [9]. However, the research for more environmentally acceptable alternatives in surface modification processes has led to the identification of rare earth metal salts as good alternatives to chromate [10][11][12][13][14]. The use of rare earth metals salts in the PEO process has been already reported in literature.…”

Section: Introductionmentioning

confidence: 99%

Sealing of PEO Coated AZ91 Magnesium Alloy Using La-Based Solutions

Pezzato

Brunelli

Babbolin

et al. 2017

International Journal of Corrosion

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In this work, solutions containing lanthanum salts were used for a post-treatment of sealing to increase the corrosion resistance of PEO coated AZ91 alloy. PEO coatings were produced on samples of AZ91 magnesium alloy using an alkaline solution containing sodium hydroxide, sodium phosphates, and sodium silicates. The sealing treatment was performed in a solution containing 12 g/L of La(NO3)3at pH 4 at different temperatures and for different treatment times. Potentiodynamic polarization test, an EIS test, showed that the sealing treatment with solution containing lanthanum nitrate caused a remarkable increase in the corrosion resistance. The corrosion behavior was correlated with the surface morphology and elemental composition evaluated with scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). In particular, the sealing treatment at 50°C for 30 min resulted in being the most promising to increase the corrosion properties of PEO treated samples because of the formation of a homogeneous sealing layer, mainly composed of La(OH)3.

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Section: Introductionmentioning

confidence: 99%

Sealing of PEO Coated AZ91 Magnesium Alloy Using La-Based Solutions

Pezzato

Brunelli

Babbolin

et al. 2017

International Journal of Corrosion

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“…Even, the corrosion resistance performance increases proportionately with dipping time. [ 156 ] Thus, other conversion coatings can also be checked with their performance if they exhibit any synergic effect alike.…”

Section: Conclusion and Future Trendsmentioning

confidence: 99%

Coatings made from chemicals: A review

Chowdhury,

Nepal,

Bhattarai

et al. 2023

Vietnam Journal of Chemistry

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In the ongoing process of civilization, surface modification has become almost an indispensable route to enjoy the optimum benefit from any material in the materialistic world. Especially, active metals require the modification maximum to escape the natural corrosion or passivation. The retention of sound performance of the metals as well as extension of their lifetime can be achieved by surface modification of coating formation. Chemical coating is one of the simple and low‐cost methods of coating with great versatility including pre‐treatment and post‐treatment. This paper includes the most widely used inorganic and organic chemical coating methods and their fewer details and their future outlooks.

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“…According to Lin et al [134], conversion coatings of lanthanum and cerium could improve the corrosion resistance of AZ63 alloy. An increment in immersion time resulted in the improvement of the inhibition effect provided by the dual rare-earth film.…”

Section: Rare Earth Conversion Coatingsmentioning

confidence: 99%