Influence of Surface Pretreatment on Coating Morphology and Corrosion Performance of Cerium-Based Conversion Coatings on AZ91D Alloy

Maddela, Surender; O’Keefe, Matthew J.; Wang, Yar‐Ming; Kuo, Hong-Hsiang

doi:10.5006/1.3516220

Cited by 36 publications

(22 citation statements)

References 21 publications

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“…The cross-sectional microstructure showed through-thickness cracks indicating that the substrate was directly exposed to the corrosive environment during salt spray. Electrolyte concentrations between 0.1 and 5 wt% NaCl solutions have been widely reported for electrochemical measurements of magnesium alloys (3,(6)(7)(8)(9)(10)(11)15). The electrochemical analysis for this study was performed with two electrolyte solutions containing 1.6 wt% NaCl and 0.6 wt% NaCl + 0.6 wt% (NH 4 ) 2 SO 4 .…”

Section: Resultsmentioning

confidence: 99%

“…It has been also demonstrated that corrosion of Mg alloys can be minimized by reducing surface contaminations and applying protective coatings (5,6,9). Moreover, corrosion studies have shown that cerium-based conversion coatings, an environmental friendly alternative, can increase the corrosion resistance of a variety of magnesium alloys (5,10,(15)(16).…”

Section: Introductionmentioning

confidence: 99%

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A Comparative Study on the Corrosion Resistance of Cerium-Based Conversion Coatings on AZ91D and AZ31B Magnesium Alloys

et al. 2012

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In the present work a comparative study has been carried out on the surface morphology, electrochemical properties and corrosion performance of cerium-based conversion coatings (CeCCs) on AZ91D and AZ31B magnesium alloys. The as-deposited coatings consisted of a two layer structure: a continuous Mg/Al oxide transition layer of ~ 50 nm thick and a CeCC layer of ~ 400 nm thick. Potentiodynamic polarization and impedance spectroscopy results using a 0.6 wt% NaCl and 0.6 wt% (NH 4 ) 2 SO 4 electrolyte showed that cerium-based conversion coatings enhanced the corrosion resistance of AZ91D and AZ31B magnesium alloys compared to polished uncoated samples. Good correlation of electrochemical test and ASTM B117 salt spray was realized.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Corrosion Resistance of Cerium-Based Conversion Coatings on AZ91D and AZ31B Magnesium Alloys

et al. 2012

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“…Maddela et al 101 investigated the corrosion protection provided by Ce-based conversion coatings formed on an AZ91D magnesium alloy using potentiodynamic polarization measurements, EIS and salt fog testing. The effects of acid (H 2 SO 4 ) and alkaline (Na 2 CO 3 ) pretreatments on the coating morphology and corrosion resistance of the cerium conversion layer were evaluated.…”

Section: 8mentioning

confidence: 99%

Testing and analysis techniques in rare earth inhibitor research

Tan

Huang

Mansfeld

2014

Rare Earth-Based Corrosion Inhibitors

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“…They need very robust coatings in the marine atmosphere, as they are much more active than the traditional substrate metals and behave differently in electrochemical experiments [158], which can significantly influence the coating formation and protection performance. By utilizing the special surface alkalization effect of Mg, a new coating technique, Electroless E-coating process, has been developed for Mg alloys [86,158,162,[299][300][301][302][303][304][305][306], in which surface wetness is critical to the coating performance [89,158,299,300]. Obviously, different substrates will have different electrochemical characteristics, which may lead to different coating formation and protection behaviors.…”

Section: Coating On New Marine Materialsmentioning

confidence: 99%

Modification, Degradation and Evaluation of a Few Organic Coatings for Some Marine Applications

Song

Feng

2020

CMD

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Organic coatings for marine applications must have great corrosion protection and antifouling performance. This review presents an overview of recent investigations into coating microstructure, corrosion protection performance, antifouling behavior, and evaluation methods, particularly the substrate effect and environmental influence on coating protectiveness, aiming to improve operational practice in the coating industry. The review indicates that the presence of defects in an organic coating is the root cause of the corrosion damage of the coating. The protection performance of a coating system can be enhanced by proper treatment of the substrate and physical modification of the coating. Environmental factors may synergistically accelerate the coating degradation. The long-term protection performance of a coating system is extremely difficult to predict without coating defect information. Non-fouling coating and self-repairing coatings may be promising antifouling approaches. Based on the review, some important research topics are suggested, such as the exploration of rapid evaluation methods, the development of long-term cost-effective antifouling coatings in real marine environments.

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Influence of Surface Pretreatment on Coating Morphology and Corrosion Performance of Cerium-Based Conversion Coatings on AZ91D Alloy

Cited by 36 publications

References 21 publications

A Comparative Study on the Corrosion Resistance of Cerium-Based Conversion Coatings on AZ91D and AZ31B Magnesium Alloys

A Comparative Study on the Corrosion Resistance of Cerium-Based Conversion Coatings on AZ91D and AZ31B Magnesium Alloys

Testing and analysis techniques in rare earth inhibitor research

Modification, Degradation and Evaluation of a Few Organic Coatings for Some Marine Applications

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