A Non Chromate Conversion Coating Process for Corrosion Protection of Al2024 Aluminium Alloy in a Marine Environment

2006 ◽  
Author(s):  
W C Tucker ◽  
◽  
M G Medeiros ◽  
R Brown ◽  
D Maddala ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Corrosion Protection ◽  
Marine Environment ◽  
Conversion Coating ◽  
Coating Process ◽  
Chromate Conversion Coating

Investigation of the chromate conversion coating on Alclad 2024 aluminium alloy: effect of the pH of the chromate bath

2002 ◽  
Vol 47 (7) ◽  
pp. 1097-1113 ◽  
Author(s):  
P. Campestrini ◽  
E.P.M. van Westing ◽  
A. Hovestad ◽  
J.H.W. de Wit
Keyword(s):  
Aluminium Alloy ◽  
Conversion Coating ◽  
Chromate Conversion Coating ◽  
Alloy Effect

scholarly journals Corrosion behaviour of a 2219 aluminium alloy treated with a chromate conversion coating exposed to a 3.5% NaCl solution

2011 ◽  
Vol 53 (4) ◽  
pp. 1214-1223 ◽  
Author(s):  
Rossana Grilli ◽  
Mark A. Baker ◽  
James E. Castle ◽  
Barrie Dunn ◽  
John F. Watts
Keyword(s):  
Aluminium Alloy ◽  
Corrosion Behaviour ◽  
Conversion Coating ◽  
Nacl Solution ◽  
Chromate Conversion Coating

scholarly journals Design and Multidimensional Screening of Flash-PEO Coatings for Mg in Comparison to Commercial Chromium(VI) Conversion Coating

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 337
Author(s):  
Ewa Wierzbicka ◽  
Marta Mohedano ◽  
Endzhe Matykina ◽  
Raul Arrabal
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Conversion Coating ◽  
Neutral Salt ◽  
Chromium Vi ◽  
Alkaline Electrolytes ◽  
Az31b Alloy ◽  
Plasma Electrolytic

REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) regulations demand for an expedient discovery of a Cr(VI)-free alternative corrosion protection for light alloys even though the green alternatives might never be as cheap as current harmful technologies. In the present work, flash- plasma electrolytic oxidation coatings (FPEO) with the process duration < 90 s are developed on AZ31B alloy in varied mixtures of silicate-, phosphate-, aluminate-, and fluoride-based alkaline electrolytes implementing current density and voltage limits. The overall evaluation of the coatings’ anticorrosion performance (electrochemical impedance spectroscopy (EIS), neutral salt spray test (NSST), paintability) shows that from nine optimized FPEO recipes, two (based on phosphate, fluoride, and aluminate or silicate mixtures) are found to be an adequate substitute for commercially used Cr(VI)-based conversion coating (CCC). The FPEO coatings with the best corrosion resistance consume a very low amount of energy (~1 kW h m−2 µm−1). It is also found that the lower the energy consumption of the FPEO process, the better the corrosion resistance of the resultant coating. The superb corrosion protection and a solid environmentally friendly outlook of PEO-based corrosion protection technology may facilitate the economic justification for industrial end-users of the current-consuming process as a replacement of the electroless CCC process.

Effects of corrosion on a steel bowstring bridge in marine environment: A case-study of assessment and retrofit

2021 ◽  
Vol 16 (4) ◽  
pp. 121-137
Author(s):  
Michele Fabio Granata
Keyword(s):  
Corrosion Protection ◽  
Marine Environment ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
In Situ Tests ◽  
Limit States ◽  
Intervention Measures ◽  
Near Future

The case-study of a steel bowstring bridge set in a marine environment and highly damaged by corrosion is presented. The bridge was built in 2004 and was repainted for corrosion protection in 2010. Despite the recent construction and the maintenance interventions, many structural elements like hangers are highly damaged by corrosion with decreasing performance in terms of serviceability and ultimate limit states. A deep investigation was carried out in order to assess the bridge and to establish the necessary retrofit actions to be carried out in the near future. In-situ tests reveal the reduced performance of the original steel in terms of strength and corrosion protection, together with the inefficiency of the successive maintenance interventions. The paper presents assessment of the bridge and retrofit measures, including replacement of the hangers and galvanization through thermal spray coating technology, in order to increase its service life. The results of the investigations and the intervention measures are outlined and discussed.

Ni-Al polyvanadate layered double hydroxide with nanoceria decoration for enhanced corrosion protection of aluminium alloy

2021 ◽  
Vol 211 ◽  
pp. 106199
Author(s):  
Jerin K. Pancrecious ◽  
S.V. Vineetha ◽  
Ulaeto Sarah Bill ◽  
E. Bhoje Gowd ◽  
T.P.D. Rajan
Keyword(s):  
Aluminium Alloy ◽  
Corrosion Protection ◽  
Layered Double Hydroxide ◽  
Double Hydroxide

Chromate Conversion Coating on Aluminum Alloys

2004 ◽  
Vol 151 (6) ◽  
pp. B359 ◽  
Author(s):  
P. Campestrini ◽  
H. Terryn ◽  
J. Vereecken ◽  
J. H. W. de Wit
Keyword(s):  
Aluminum Alloys ◽  
Conversion Coating ◽  
Chromate Conversion Coating
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