Toughening mechanisms of rubber modified thin film epoxy resins: Part 2—Study of abrasion, thermal and corrosion resistance

• Published in: Progress in organic coatings 2017-12, Vol.113, p.136-142
• Main Authors: Yahyaei, Hossein, Ebrahimi, Morteza, Tahami, Hamed Vakili, Mafi, Ehsan R., Akbarinezhad, Esmaeil
• Format: Article
• Language: English
• Subjects: Abrasion resistance; Abrasion resistant coatings; Abrasives; Butadiene; Contact angle; Corrosion effects; Corrosion prevention; Corrosion protection; Corrosion resistance; EIS; Electrochemical impedance spectroscopy; Epoxy coating; Epoxy resins; Gravimetric analysis; Hydrophobic surfaces; Hydrophobicity; Protective coatings; Rubber; Sodium chloride; Studies; Thermal analysis; Thermal resistance; Thin film coatings; Toughening
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2017.09.007

•ETPB modification of epoxy resin increased damping energy of coatings.•ETPB modification of epoxy resin improved abrasion resistance of coating.•ETPB incorporation into epoxy resin increased hydrophobicity of coatings and decreased the water uptake of coatings.•Corrosion resistance of epoxy coatings increased by ETPB modification. This paper presents corrosion and abrasion resistance of an epoxy system modified by using a synthesized epoxy terminated polybutadiene (ETPB) resin with good toughening properties. The effect of this modification on the hardness, abrasion, thermal and corrosion protection performance of the resultant modified coatings was investigated. Pendulum hardness test showed that the incorporation of ETPB into epoxy matrix increased damping energy of the system. Taber experiment showed that rubber modification increased abrasion resistance of epoxy coatings. Thermal gravimetric analysis (TGA) of samples showed that the thermal resistance of ETPB modified epoxy coatings was almost the same as that for the neat one. The corrosion protection performance of rubber modified and unmodified epoxy coatings were investigated using electrochemical impedance spectroscopy (EIS) in 3.5% sodium chloride solution for a period of 90days. EIS studies showed that both coatings remained intact with good corrosion resistance properties. Film resistance of unmodified and ETPB modified epoxy coatings after 90days of immersion were found to be 2.59×1010Ωcm2 and 2.70×1010Ωcm2, respectively. The addition of hydrophobic butadiene rubber into epoxy resin increased the water contact angle from 77° to 85°. This increment in hydrophobicity decreased the water uptake of modified epoxy coating.