Nanotechnology in Coil Coating Pretreatment to Change the Phase of Coating Industry.
Regarding the world of metal surface treatment, some nanoparticles are currently used in pretreatment processes to form conversion coatings. Nanotechnology enhances the technological changes which are directly related to improvement of nano-polymer composites. These materials exhibit good abrasion and wear resistance by mechanical strength, lightness, ease of processing, versatility and low cost, together with acceptable thermal and environmental resistances which are suitable for coating applications. Coil coating industry has experienced various advantages with the advent of novel nano technologies for coil coating pretreatments such as Reduction of pretreatment stages, faster and easier solution control and management, elimination of rinsing stages with demineralized water consumption, elimination of waste to treat in the water treatment plant and consequent elimination of waste sludges disposal, increase of the mechanical characteristics and corrosion resistance performances and more.
Nanoparticle-based lubricant additives (mostly boron or carbon) that can compete on performance with traditional coil coating materials are being developed, which interact with the contact surface to produce a low environmental impact and high performance. Some of the nanoparticles commercially used in pretreatment process to form conversion coating include zirconium, titanium and manganese acidic solution. Moreover, Silicium, cerium and aluminium oxide nanoparticles are frequently used in the preparation to enhance the corrosion resistance properties of the conversion coatings.
However, it is evident that some nanoparticles in some condition can be toxic so it’s essential to continue the innovative trend without forgetting safety and environmental concerns.
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