Surface and Electrochemical Characteristics of Novel Chromate-Free Mn-V Oxyanion Sealed Tartaric–Sulfuric Acid Anodized Coating
| Autor: | C. M. Manjunatha, G. Yoganandan, K. V. Nagacharan, V. Ezhilselvi, Meenu Srivastava, A. R. Anilchandra, NT Manikandanath, J.N. Balaraju |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Chromate conversion coating Anodizing 020209 energy Mechanical Engineering Sulfuric acid 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Corrosion chemistry.chemical_compound Coating chemistry Mechanics of Materials Ultimate tensile strength 0202 electrical engineering electronic engineering information engineering engineering Chromic acid Salt spray test General Materials Science 0210 nano-technology Nuclear chemistry |
| Zdroj: | Journal of Materials Engineering and Performance. 27:6175-6188 |
| ISSN: | 1544-1024 1059-9495 |
| DOI: | 10.1007/s11665-018-3648-4 |
| Popis: | In the present investigation, a novel chromate-free Mn and V oxyanions sealed tartaric–sulfuric acid anodic oxide coating (TSA) was developed on airframe grade aluminum alloy (AA2024). The results obtained from field emission scanning electron microscopy and energy-dispersive x-ray analysis showed effective surface modification of TSA after Mn-V oxyanions sealing (TSAMnVO). Potentiodynamic polarization results showed no significant difference in corrosion current density value (0.01 µA/cm2) after 1 h and 336 h of immersion in 3.5% NaCl solution. EIS result exhibited barrier layer resistance (Rb) value of TSAMnVO > 106 kΩ cm2 even after 336 h of immersion in NaCl solution. The 3D profile and Raman analysis showed no significant difference in the topography and composition, respectively, on the surface of TSAMnVO even after 1000 h of salt spray test. TSAMnVO also showed excellent adhesion with aircraft grade epoxy primer as per the ASTM 3359. Tensile and constant amplitude fatigue test results of TSAMnVO exhibited ultimate tensile strength and number of cycles to failure comparable with chromic acid anodization (CAA) process. Hence, the developed novel TSAMnVO coating system eliminates the usage of chromate ions completely in anodization process since it provides comparable corrosion resistance and mechanical properties with CAA. |
| Databáze: | OpenAIRE |
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