The effect of surface pre‐treatments on corrosion behavior of cerium‐based conversion coatings on Al 7075‐T6

Danaee, I.; Zamanizadeh, H R; Fallahi, Mahmoud; Lotfi, Behnam

doi:10.1002/maco.201307147

Cited by 24 publications

(16 citation statements)

References 27 publications

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“…However, hexavalent chromium presents very high toxicity and has unusual environmental impact [17][18][19] . For this reason, an intense research effort is being undertaken to replace chromates by more environmentally friendly compounds.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Anti-Corrosive Properties of Cerium Oxide Conversion Coatings on Steel X52

2017

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In this study, cerium-based conversion coating was deposited on steel X52 by dip immersion method. Cerium oxide/hydroxide is an environmentally friendly conversion coating. The effects of immersion times and immersion temperatures on corrosion properties of cerium conversion coating on steel X52 were studied. Its corrosion resistance in 3.5 wt.% NaCl solution was investigated by means of electrochemical impedance spectroscopy, potentiodynamic polarization, and surface techniques. The coated samples showed a significant decrease in corrosion rate and corrosion current decreased with increasing immersion time up to 60 s. In addition, electrochemical impedance data showed that in the presence of cerium oxide conversion coatings, the charge transfer resistance of aluminum increased. The experimental results indicated that the corrosion resistance decreased with increasing the operating temperature. Surface morphology and its chemical composition were analyzed by means of scanning electron microscopy and energy dispersive spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Preparation and Anti-Corrosive Properties of Cerium Oxide Conversion Coatings on Steel X52

2017

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“…In addition, the phosphating process is quite sensitive to the surface status of Mg substrate as other chemical conversion processes . The pretreatment process is especially important, and suitable pretreatments are effective method to further enhance the properties of chemical conversion films . Previous pretreatment investigations mainly focus on forming a thin surface layer to improve homogeneity and protect the Mg substrate from corrosion .…”

Section: Introductionmentioning

confidence: 99%

An optimization of pretreatment for the phosphate conversion film on WE43 magnesium alloy

Dong

Song

Shan

et al. 2017

Materials & Corrosion

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A two‐step method pretreatment was used to optimize the phosphate conversion film on WE43 magnesium alloy. The surface status of the pretreatment layers and their effect on the formation processes of phosphate conversion films were investigated using scanning electron microscopy (SEM), X‐ray diffraction (XRD), and X‐ray photoelectron spectroscopy (XPS) analyses. It was found that the second phases on the grain boundaries of WE43 were dissolved completely by two‐step method pretreatment. The thin pretreatment film first flaked off in the phosphate process, resulting in a more uniform surface status. Then, the phosphate particles were deposited more homogeneously. Combined with the electrochemical impedance spectroscopy (EIS) and immersion test results, the optimized pretreatment greatly improved the compactness of the conversion films, further to enhance its protective ability to Mg substrate.

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“…Lanthanide compounds have been applied as corrosion inhibitors for Al alloys . It is reported that cerium chloride (CeCl 3 ) is an effective inhibitor.…”

Section: Introductionmentioning

confidence: 99%

Corrosion inhibition of 3003 aluminum alloy by cerium chloride-sodium nitrite blend in flue gas condensate

Yang

Gao

Qin

2017

Materials and Corrosion

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The inhibition behavior of cerium chloride (CeCl3)–sodium nitrite (NaNO2) blend in acidic flue gas condensate was studied using electrochemical approaches, full immersion tests, and surface analysis. The electrochemical results revealed that the inhibition efficiency of CeCl3 reached to about 64.1% at 750 mg/L. In contrast, the inhibition efficiency of CeCl3–NaNO2 blend reached to around 91.0%, which is increased by 42.0%. It was considered that Ce3+ was oxidized to Ce4+ by NaNO2. CeO2 which is more stable than Ce2O3 formed during corrosion. Besides, NaNO2 addition promoted the generation of much finer passive film. Therefore, CeCl3–NaNO2 blend improved the corrosion protection performance.

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The effect of surface pre‐treatments on corrosion behavior of cerium‐based conversion coatings on Al 7075‐T6

Cited by 24 publications

References 27 publications

Preparation and Anti-Corrosive Properties of Cerium Oxide Conversion Coatings on Steel X52

Preparation and Anti-Corrosive Properties of Cerium Oxide Conversion Coatings on Steel X52

An optimization of pretreatment for the phosphate conversion film on WE43 magnesium alloy

Corrosion inhibition of 3003 aluminum alloy by cerium chloride-sodium nitrite blend in flue gas condensate

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