Influence of particle size in fluorine free corrosion resistance superhydrophobic coating - Optimization and stabilization of interface by multiscale roughness

• Published in: Journal of alloys and compounds Vol. 765; pp. 677 - 684
• Main Authors: Anitha, C., Syed Azim, S., Mayavan, Sundar
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.10.2018; Elsevier BV
• Subjects: Aluminum; Contact angle; Corrosion resistance; Fluorine; Hydrophobic surfaces; Hydrophobicity; Impact resistance; Mechanical properties; Nanosilica; Particle size; Protective coatings; Silicon dioxide; Silicone resin; Silicone resins; Submerging; Superhydrophobic; Surface roughness; Water uptake; Corrosion resistance; Water uptake; Superhydrophobic; Silicone resin; Nanosilica
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.06.214

Fluorine free superhydrophobic coatings with stabilized air-water interface had been fabricated by utilising different particle sized silica. Coatings were formulated with various composition of different sized nanosilica's along with nanotitania and aluminium stearate embedded in a matrix of silicone resin of Mn ∼1,65,000. The as-prepared coating exhibited higher contact angle (CA) 152.5° along with high mechanical properties like abrasion, adhesion and impact resistance. As particles with different sizes were incorporated in the coating, the interface was stabilized during immersion in water uptake study. In addition most of these coatings also exhibited exceptional corrosion resistance withstanding upto 1000 h of salt spray. •Morphological influence of the coating with two different sized nanoparticles with varying concentration in coating was studied.•Life time of the trapped air in the coating was correlated by water immersion studies.•Incorporation of various sized pigments stabilized the CB interface during intrusion of water.•Most of the as-prepared coatings possesses excellent corrosion resistance that withstand 1000 h of salt spray.