Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 3, Pages 3493-3505Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b20199
Keywords
Melting gels; Hybrid glasses; sol-gel; Hybrid coatings; AZ31 magnesium alloy; Corrosion protection; NaCl solution
Funding
- NSF DMR [1313544]
- Ministerio de Economia y Competitividad, Spain [PCIN-2013-030]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1313544] Funding Source: National Science Foundation
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Magnesium alloys, with a density two-thirds that of aluminum, are very attractive for the industry. However, these alloys are extremely susceptible to corrosion in the presence of aggressive electrolytes such as NaCl solutions. Here, we designed hybrid coatings obtained by the consolidation of organically modified polysilsesquioxanes called melting gels for the corrosion protection of AZ31 magnesium alloy in NaCl solutions. The main focus was to study the interaction between coatings and substrate and the influence of the coating thickness on the final properties. Micro-scratch tests, adhesion by tape tests, confocal Raman microscopy, SEM-EDS, and ToF-SIMS indicate good adhesion of coatings based on the interaction of melting gels and substrate. These measurements indicate the presence of the Si-O-Mg bonds between the substrate and coatings. Electrochemical results show very low current densities (10(-13) A cm(-2)) without any breakdown potential and impedance values of 10(10) Omega cm(2).
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