In advanced technological era corrosion is still considered a major problem because it is the main cause of industrial failures and loss of billions of dollars annually for preventive maintenance and restoration of metal substrates. Corrosion resistant paints protect metal components against degradation due to moisture, salt spray, oxidation or exposure to a variety of industrial chemicals. Anti-corrosion coating allows for added protection of metal surfaces and acts as a barrier to inhibit the contact between chemical compounds or corrosive materials. With the introduction of NPs as fillers in polymeric paint, the efficiency of that in terms of corrosion resistance can be increased while improvement in mechanical properties is an added advantage, which makes them suitable material for commercial applications.
Corrosion resistance of epoxy based nanocomposit can be attributed to the barrier properties of nanoparticles. Epoxy will act as a host while the nanoparticles will act as guest components. Addition of nanoparticles improves the adhesion forces between the epoxy coating and the metal surface. These particles by reducing voids in coating and increasing penetration route for corrosive solution creates a better barrier properties in polymer coatings.
- According to salt spray test ASTM B117-16, adding nanomaterials to the paint causes an increase in its anticorrosive property.
- Cross-cut test according to ASTM D1654-16 shows adding nanomaterials cause to improvement of scratch resistance
- The cross-cut test is a method for determining the resistance of paints and coatings to separation from substrates.
Salt spray testing is an accelerated corrosion test that produces a corrosive attack to coated samples in order to evaluate (mostly comparatively) the suitability of the coating for use as a protective finish.
Standard Date : 2017/12/13
Expire Date : 2018/12/12