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Development and certification of chromic acid-free anodizing process for aircraft grade aluminium alloys

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Title Statement Development and certification of chromic acid-free anodizing process for aircraft grade aluminium alloys
 
Added Entry - Uncontrolled Name Jayam, Balaraju N; Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560 017, India
Varathan, Ezhilselvi ; Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560 017, India
Srivastava, Meenu ; Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560 017, India
Thayee, Manikandanath N; Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560 017, India
Murugasen, Ganesh ; Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560 017, India
Ramasamy, Shanmugavel ; Regional Centre for Military Airworthiness (F&F-FOL), CEMILAC, DRDO, Bangalore 560 037, India
Kale, Shirish Sharad; Regional Centre for Military Airworthiness (F&F-FOL), CEMILAC, DRDO, Bangalore 560 037, India
Kasturi, Nagacharan V; Centre for Civil Aircraft Design & Development, CSIR-National Aerospace Laboratories, Bangalore 560 017, India
Chikkamadal, Manjunatha M; Structural Integrity Division, CSIR- National Aerospace Laboratories, Bangalore 560 017, India
CSIR NAL
 
Uncontrolled Index Term Materials science; Surface modification
TSA process, Anodization, Chromic acid-free, Certification
 
Summary, etc. <p>Chromic acid (Cr<sup>6+</sup>) anodization process is widely used for the corrosion protection of aircraft aluminium alloys. Hexavalent chromium being toxic in nature need to be phased out by eco-friendly alternatives. In the present study modified tartaric-sulphuric acid (TSA) process has been developed followed by sealing in permanganate based bath to obtain 4 to 6 µm thick anodic oxide layer on 2024-T3, 6061-T6 and 7075-T6 aluminium alloys. The process was carried out using a pilot scale anodizing plant. The anodized specimens were characterized for visual observation, thickness, adhesion, electrical breakdown voltage, corrosion resistance and tensile behaviour. All the tests were carried out as per MIL-A-8625F specifications. The specimens were also subjected for about 800 hrs to real time corrosion testing, 200 metres away from sea shore at Mandapam Camp, Rameshwaram, India. The performance of the permanganate sealed TSA anodized aluminium alloys are comparable with that of the conventional chromic acid anodized coatings. This chromic acid-free anodization process has been qualified to airworthiness regulating standards by Indian military certification authorities. Efforts are in progress to commercialize this technology for use on aero platforms.</p>
 
Publication, Distribution, Etc. Indian Journal of Engineering and Materials Sciences (IJEMS)
2021-06-16 15:02:51
 
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http://op.niscair.res.in/index.php/IJEMS/article/view/31016
 
Data Source Entry Indian Journal of Engineering and Materials Sciences (IJEMS); ##issue.vol## 28, ##issue.no## 1 (2021): IJEMS- February 2021
 
Language Note en
 
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