Growth behavior of lanthanum conversion coating on hot-dip galvanized steel

Zhang, Shuang-hong; Kong, Gang; J, Lu; Che, Chunshan; Liu, Lingyan

doi:10.1016/j.surfcoat.2014.10.017

Cited by 47 publications

(12 citation statements)

References 23 publications

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“…Ce 3+ in the coating can migrate to the scratch and cover the damaged sites with the precipitation of Ce(OH) 3 or Ce 2 O 3 . Zhang et al [ 71 ] reported that the lanthanum salt conversion coating, mainly composed of La(OH) 3 /La 2 O 3 and Zn(OH) 2 /ZnO, was prepared on the surface of HDG steel, resulting in improved corrosion resistance. Montemor et al [ 69 ] compared the effects of different RE conversion coatings on galvanized steel by immersion in the nitrate solutions of RE metals (cerium, yttrium and lanthanum).…”

Section: Brief Review On Industrial Zn Alloys and Their Surface Modification Methodsmentioning

confidence: 99%

A review on current research status of the surface modification of Zn-based biodegradable metals

Yuan

Xia

et al. 2022

Bioactive Materials

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Recently, zinc and its alloys have been proposed as promising candidates for biodegradable metals (BMs), owning to their preferable corrosion behavior and acceptable biocompatibility in cardiovascular, bone and gastrointestinal environments, together with Mg-based and Fe-based BMs. However, there is the desire for surface treatment for Zn-based BMs to better control their biodegradation behavior. Firstly, the implantation of some Zn-based BMs in cardiovascular environment exhibited intimal activation with mild inflammation. Secondly, for orthopedic applications, the biodegradation rates of Zn-based BMs are relatively slow, resulting in a long-term retention after fulfilling their mission. Meanwhile, excessive Zn 2+ release during degradation will cause in vitro cytotoxicity and in vivo delayed osseointegration. In this review, we firstly summarized the current surface modification methods of Zn-based alloys for the industrial applications. Then we comprehensively summarized the recent progress of biomedical bulk Zn-based BMs as well as the corresponding surface modification strategies. Last but not least, the future perspectives towards the design of surface bio-functionalized coatings on Zn-based BMs for orthopedic and cardiovascular applications were also briefly proposed.

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Section: Brief Review On Industrial Zn Alloys and Their Surface Modification Methodsmentioning

confidence: 99%

A review on current research status of the surface modification of Zn-based biodegradable metals

Yuan

Xia

et al. 2022

Bioactive Materials

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“…Thus, R f1 and CPE f1 are added in the equivalent circuit as shown in Fig. 11a to fit T10M, T60M and T300M [33]. For T1800M, the two-time constant is used to fit T1800M, as shown in Fig.…”

Section: Anti-corrosion Performance Of Hydrophobic Conversion Filmsmentioning

confidence: 99%

Effect of Silane Coating on the Corrosion Resistance of TiO2 Conversion Films

Lai¹

2018

International Journal of Electrochemical Science

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TiO 2 conversion films were prepared on surfaces undergoing the hot-dip galvanizing (HDG) process using titanium sulphate (Ti(SO 4 ) 2 ) as the titanium source and hydrogen peroxide (H 2 O 2 ) as the chelating agent by a one-step impregnation method. The effect of passivation time on the morphology and corrosion resistance of the film was investigated. The results show that a large amount of TiO 2 nanospheres appear on the HDG surface after a short immersion time. By increasing the immersion time, the nanospheres are gradually covered by the ZnO/Zn(OH) 2 conversion film, and some cracks appear on the conversion film. The electrochemical results reveal that the integral TiO 2 conversion film shows better corrosion resistance, and the cracks cause the pitting of the corrosion resistance. To improve its corrosion resistance, the TiO 2 conversion film was modified by silane to realize hydrophobic sealing, which results in obvious changes in the morphology and corrosion resistance. After modification, the gel layer covered the TiO 2 conversion film, which would fill the cracks and make the film hydrophobic. Thus, the corrosion resistance of the modified conversion film increased. The better the hydrophobicity of the film is, the better the corrosion resistance of the film is for a short immersion time. In addition, the corrosion resistance of the hydrophobic film is mainly determined by the bottom TiO 2 conversion film.

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“…3). [55][56][57][58] or lanthanum nitrate (La(NO 3 ) 3 ) 59,60 ) tend to form Cerium or Lanthanum oxides/hydroxides at a pH > 10, and therefore could inhibit cathodic reactions on corroding surfaces. Indeed, rare-earth salts were able to inhibit the corrosion of several systems such as Zn, galvanized steel, Mg, or Al alloys and successfully integrated into primers or conversion coatings.…”

Section: Introductionmentioning

confidence: 99%

Chromate replacement: what does the future hold?

Gharbi

Thomas

Smith³

et al. 2018

npj Mater Degrad

185

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The ubiquitous use of chromium and its derivatives as corrosion preventative compounds accelerated rapidly after the second industrial revolution, with such compounds now integral to modern society. However, the detrimental impact of chromium compounds on the environment and human health has prompted the need to revisit the majority of current industrial corrosion protection measures. This review retraces the origins of chromium replacement motivations, introducing the various legislative actions aimed at diminishing the use of chromium compounds, and critically reviews alternative corrosion preventative technologies developed in the recent decades to now. The review, herein, is intended for a broad audience in order to provide a concise update to an increasingly timely issue.

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Growth behavior of lanthanum conversion coating on hot-dip galvanized steel

Cited by 47 publications

References 23 publications

A review on current research status of the surface modification of Zn-based biodegradable metals

A review on current research status of the surface modification of Zn-based biodegradable metals

Effect of Silane Coating on the Corrosion Resistance of TiO2 Conversion Films

Chromate replacement: what does the future hold?

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