48 discussion of the properties and characteristics

  • No School
  • AA 1
  • 35

This preview shows page 12 - 14 out of 35 pages.

48 Discussion of the properties and characteristics of hybrid materials related to experimental synthesis conditions 2011 Pandey and Mishra 49 Description of synthesis routes to produce hybrid composite materials derived by combining the sol–gel approach and organic polymers Sanchez et al. 15 Discussion of the major applications of OIH (biological based) materials 2012 Balgude and Sabnis 50 Description of potential of sol–gel-derived hybrid coatings processes for the production of multifunctional pretreatments for metallic substrates 2013 Abdolah Zadeh et al. 51 Discussion of the most relevant existing works on self-healing sol–gel coatings Chaturvedi and Dave 52 Discussion of the methods to design nanomaterials where emphasis was given to the sol–gel method J. Coat. Technol. Res.
Image of page 12
OIH coatings for corrosion protection of iron-based alloys Steel is the most common and versatile metal currently applied and can be classified either as carbon steel (CS) or steel alloy (SA). SA materials cover an extensive range of steels including low-SAs, stainless steel (SS), heat-resistant steels, and tool steels. 65 SS can be produced with a wide range of properties and can be used in many different industrial fields, owing to their mechanical and corrosion properties. 65 Steel surface substrates are traditionally passivated by the use of conversion coatings, phosphating, and chromating. These treatments produce a layer of corrosion pro- ducts—the passivation layer—capable of resisting fur- thering chemical attack. However, due to the high toxicity associated with the use of chromates, several efforts are being made all over the world to find environmentally friendly treatments. OIHs obtained through sol–gel method are potential candidates as the presence of the metal oxides, on the treated steel surfaces, allows covalent bonding between the inor- ganic parts of the OIHs based on siloxanes (Si–O–metal oxide), as shown in Fig. 9 , and making them suitable alternatives to the conventional conversion coatings. The corrosion resistance behavior of sol–gel coat- ings or thin films deposited onto these particular metallic substrates has been extensively studied. The studies performed were mainly aimed at testing the capability of sol–gel coatings to improve oxidation and corrosion resistance of the substrate. The most relevant information and conclusions gathered from the analyzed papers about the use of OIH gels based on siloxane (i.e., at least one of the precursors used is based on siloxanes) coatings are summarized in Table 3 , which is organized according to date of publication. By analyzing the content of the collected bibliography, it was concluded that the study of alternative precursors for the production of new OIH materials, using sol–gel technology seems to have slightly evolved when compared with the amount of precursors available in the market.
Image of page 13
Image of page 14

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