Thermal deformation of aluminum alloy casting materials for tire mold by numerical analysis

Yoon, Heesung; Choi, Je-Se; Oh, Yool Kwon

doi:10.1016/s1003-6326(12)61816-0

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…According to the E-pH corrosion diagram for pure Al at 25qC in water, the passivation occurs between pH=5 and pH=7 [12]. When Al 2024-T3 is coated with Prbased primer and exposed to a corrosive environment, cathodic protection takes place via the presence Pr-based inhibitor compounds.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Characterization of Transport Processes in a Praseodymium-Containing Coating

et al. 2010

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The electrochemical response of Pr-containing epoxy-polyamide primers on aluminum alloy 2024-T3 substrates was investigated. The effect of electrolyte pHs on corrosion behavior was studied before and after salt spray exposure. X-ray diffraction analysis confirmed that the praseodymium phase that was added to the primer converted into Pr(OH)3 in the as-deposited coating and remained present in the primer up to 3000 hours of salt spray exposure. Examination of panels prior to salt spray testing indicated that Pr was not detected in the scribes; however, following salt spray testing, Pr-rich species were found in localized clusters in scribes. Electrochemical tests were performed on test panels with machined defects using electrolyte pHs ranging from 5 to 8. The largest change in passivation range occurred at pH=8, and was two times higher than the change observed for bare Al 2024-T3. Corrosion protection of Pr-based primers is due to the ability of Pr-rich species to dissolve from coatings during exposure to corrosive environment and is influenced by pH.

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Section: Electrochemical Characterizationmentioning

confidence: 99%

Characterization of Transport Processes in a Praseodymium-Containing Coating

et al. 2010

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“…Chromate conversion coatings (CrCCs) and chromated primers have been widely used to provide corrosion protection for high strength aluminum alloys (i.e. Al 2024-T3 and Al 7075-T6) used in aircraft construction [1][2]. Although chromates are highly effective corrosion inhibitors, these compounds are toxic and carcinogenic [3Therefore, a variety of non-chromate corrosion inhibitors have been developed as environmentally friendly alternatives to chromates, including rare earth (RE) compounds [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Phase on the Electrochemical and Morphological Properties of Praseodymium-Based Coatings

et al. 2011

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The corrosion protection of epoxy-polyamide primers containing either hexagonal Pr2O3 or cubic Pr6O11 inhibitors deposited on chromate conversion coated Al 2024-T3 substrates was studied. Electrochemical evaluations, scanning electron microscopy with energy dispersive spectroscopy, and x-ray diffraction were used to characterize primers. The electrochemical response of coated panels prior to and following ASTM B117 salt spray exposure was also studied. The addition of PrOx species to the primer matrix improved the corrosion protection of artificial defects by decreasing icorr values from ~10-7 to ~10-9 A/cm2, increasing the passivation range (> 300 mV), and shifting Ecorr values to more negative potentials. After salt spray testing, Pr-hydroxide/hydroxycarbonate species were present on the surfaces of the primers. The addition of Pr2O3 afforded enhanced corrosion protection compared to the addition of Pr6O11 because Pr2O3 is a more reactive phase that provided more Pr3+ species for transport and reaction than Pr6O11.

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