2020
DOI: 10.1149/1945-7111/aba4ea
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Investigation of the Trivalent Chromium Process Conversion Coating as a Sealant for Anodized AA2024-T3

Abstract: The sealing of an anodic coating on AA2024-T3 with a trivalent chromium process coating (TCP-HF) was investigated. Specimens were anodized in 9.8 wt% H 2 SO 4 at 15 V DC (23 min) producing an oxide coating weight of ca. 1200 mg ft −2 and a thickness of ca. 5 μm. Elemental analysis revealed the sealant forms across the outer oxide layer and within the pores up to a depth at least approaching 1 μm. Anodic and cathodic currents in potentiodynamic polarization curves were suppressed by 5-10× and low frequency impe… Show more

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Cited by 6 publications
(9 citation statements)
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“…The 15 V used herein is a typical anodization voltage for aluminum and was used in our prior work with anodized AA2024-T3. 33 The current then declines over the next 3 min, trending toward a more constant value of 6-7 mA cm −2 for the duration of the anodization. During the ramp, the proportional increase in current density is because of the higher rate of oxidation with increasing voltage.…”
Section: Resultsmentioning
confidence: 95%
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“…The 15 V used herein is a typical anodization voltage for aluminum and was used in our prior work with anodized AA2024-T3. 33 The current then declines over the next 3 min, trending toward a more constant value of 6-7 mA cm −2 for the duration of the anodization. During the ramp, the proportional increase in current density is because of the higher rate of oxidation with increasing voltage.…”
Section: Resultsmentioning
confidence: 95%
“…A DC power supply (Tenma) was used to control the applied voltage for anodization, as described previously. 33 The positive terminal was connected to the AlSi 10 Mg specimen (anode) with a wire and alligator clip. The cathode was a piece of SS304L plate with dimensions of 2.5 cm × 1.7 cm and a 0.1 cm thickness.…”
Section: Experimental Methodsmentioning
confidence: 99%
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