Challenges and strategies of surface modification of electrogalvanized coatings for electron microscopy analysis

Jantaping, Narin; Banjongprasert, Chaiyasit; Chairuangsri, Torranin; Patakham, Ussadawut; Boonyongmaneerat, Yuttanant

doi:10.1016/j.micron.2016.04.006

Cited by 1 publication

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whereas the first problem is commonly mitigated by using oil-based lubricants as polishing mediums, the best practice for the latter issue remains unclear. Therefore, the present study has demonstrated the challenges and strategies of surface modification of electrogalvanized coatings for electron microscopy analysis [19]. For more information, a full paper is reported in Appendix.…”

Section: Cross Sectioning For Metallographymentioning

confidence: 80%

“…For hexagonal crystals, in particular, the order of crystal planes with respect to decreasing the atomic surface density is {002} > {110} > {101} > {100}. It thus has been generally found that zinc coatings with {002} planes presented on the surface show relatively high surface hardness and high corrosion resistance [18,19,23]. Here, the weakly-packed atomic plane {100} is increasingly dominant on the specimens' surface in the order of EZ3 < EZ2 < EZ1, which corresponds well to their increasing levels of the measured corrosion rates, respectively.…”

Section: Relationship Between Structure and Corrosion Behavior Of Ezmentioning

confidence: 99%

“…Nevertheless, thus far, a scientific understanding of the relationship between the microstructure and corrosion behaviors of electrodeposited zinc has not been fully established. This is at least partly an issue of scale and complexity: zinc coatings have intricate micro/nano-structural features, and are often capped with an extremely thin (and difficult to characterize) chromate conversion coating (CCC), which require a systematic and comprehensive study with an aid of advanced techniques for characterizations [17][18][19]. Among the relevant structural features, surface morphology [20,21], crystallite size [22][23][24], and texture [25][26][27][28][29][30],…”

Section: Chapter I Introduction 11 Overviewmentioning

confidence: 99%

See 2 more Smart Citations

Nanostructural Investigation and Engineering of Electrodeposited Zinc Coatings and Their Chromium and Graphene-Based Passivation Layers

Jantaping

View full text Add to dashboard Cite

Electrodeposited zinc is an important type of coating used widely for corrosion protection in various applications. Nevertheless, the understanding on the relationships between coating fabrication process, micro/nanostructure, and properties of the material is rather limited. This thesis aims to develop structure-corrosion property relationship frameworks for the electrodeposited zinc coating and its chromium conversion layer, and also explore the novel process, particularly top-coating of graphene, upon which the corrosion resistance of the zinc coating could be enhanced. The research works performed in this thesis are divided into 3 parts: (i) the processing-structure-property relationships in electrodeposited zinc, (ii) the effects of the EZ’s structure on the formation of Cr(III) passivation, and (iii) the feasibility of graphene-based coatings as a potential for protecting corrosion. A set of environmentally friendly alkaline non-cyanide zinc coatings with and without trivalent chromium passivation is prepared by the electrodeposition process for examination of their micro/nanostructure and corrosion properties. Three groups of plating additives are employed to modulate the structure of the galvanized coating. Using a suite of modern characterization techniques, including field emission scanning electron microscopy (FE-SEM), X-ray diffractometry (XRD), focused ion beam (FIB), and transmission electron microscopy (TEM), it is determined that texture and interfacial defects which are controlled by additive incorporation play critical role in controlling the corrosion behavior of the coatings. Furthermore, polyquaternary amine salt is identified as an effective additive for zinc plating as it helps promotes a formation of a relatively thick amorphous-oxide phase in the chromate film resulting in high resistance to corrosion. Finally, the feasibility study of graphene-based top coatings for corrosion shows that graphene can be coated onto a substrate using the electroplating setup. The coating of graphene is found to be controlled by additives, applied current density, and deposition time. The resulting graphene coating shows appreciable corrosion resistance results, and thus it is promising to be used for top-coating of electrogalvanized zinc.

show abstract

Section: Cross Sectioning For Metallographymentioning

confidence: 80%

Section: Relationship Between Structure and Corrosion Behavior Of Ezmentioning

confidence: 99%

Section: Chapter I Introduction 11 Overviewmentioning

confidence: 99%

See 1 more Smart Citation

Nanostructural Investigation and Engineering of Electrodeposited Zinc Coatings and Their Chromium and Graphene-Based Passivation Layers

Jantaping

View full text Add to dashboard Cite

show abstract

Challenges and strategies of surface modification of electrogalvanized coatings for electron microscopy analysis

Cited by 1 publication

References 31 publications

Nanostructural Investigation and Engineering of Electrodeposited Zinc Coatings and Their Chromium and Graphene-Based Passivation Layers

Nanostructural Investigation and Engineering of Electrodeposited Zinc Coatings and Their Chromium and Graphene-Based Passivation Layers

Contact Info

Product

Resources

About