Spectra obtained by scanning two different regions

  • No School
  • AA 1
  • 35

This preview shows page 25 - 27 out of 35 pages.

spectra obtained by scanning two different regions coated samples with three layers of OIH using dip-coating method J. Coat. Technol. Res.
Image of page 25
relevant question that must be answered is ‘‘How long are OIH coatings used to prevent corrosion able to maintain their barrier properties?’’ As such, it is vital to undertake long-term tests in the near future as the durability/resistance of OIH coatings for corrosion prevention remains unknown. The search for future OIH gel-based coatings is oriented toward low cost, pollution-free, easily synthe- sized, and effective corrosion protection OIH coatings that do not generate hazardous waste during their application and removal. Development of OIH coat- ings with self-healing properties would be a challenging innovation that will contribute in giving an added high- value to the synthesized materials. Inspired by living organisms, materials engineers are focusing on developing materials with self-healing properties. According to Ghosh, the term ‘‘self-heal- ing’’ may be defined as ‘‘ the ability of a material to heal (recover/repair) damages automatically and autonomously, that is, without any external interven- tion.’’ 259 Several authors 195 , 260 272 developed and re- viewed corrosion protection systems with self-healing abilities. The development of OIH coatings with those properties by incorporating the release of healing agents, reverting crosslinks or using simultaneous technologies such as conductivity; shape memory effect; nanoparticle migration; and co-deposition 257 might be considered as important achievements. The development of new OIH coatings with dual- behavior (a protective barrier accumulating the OIH properties with a self-healing response) is a synergy that will bring benefits and improvements in corrosion prevention, fulfilling the requests needed by the users of coatings technology. This new concept is based on multilayer coatings where inhibitors and self-healing agents are immobilized in one of the layers being isolated from the external media and metal substrate by intermediate layers. 273 It is important that the implemented procedure to obtain these new systems assures good adhesion and similar thermal expansion coefficients between the layers. This same procedure also relies on an efficient top coating layer barrier protection. Moreover, the immobilization of both self- healing and inhibitor agents within a layer apart from the metallic substrate, by intermediate layers, prevent side reactions and leakage that may affect the sub- strate. Considering the potentialities of the sol–gel method, efficient multilayer coatings could be produced if the adhesion between the metallic substrate and the contact layer is achieved, as well as the adhesion between each one of the different upper layers. Additionally, these materials show efficient barrier properties and the capacity of hosting species with different properties allows the development of an improved multilayer coating that combines corrosion inhibition and self-healing properties.
Image of page 26
Image of page 27

You've reached the end of your free preview.

Want to read all 35 pages?

  • Fall '19
  • 1984, oIh, OIH coatings

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes