Co-reporter:Dongdong Song, Zhongwei Yin, Fengjuan Liu, Hongxia Wan, Jin Gao, Dawei Zhang, Xiaogang Li
Progress in Organic Coatings 2017 Volume 110(Volume 110) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.porgcoat.2017.04.043
•MWCNTs were incorporated to water-borne acrylic coatings substrates by ball-milling.•Effect of MWCNTs content on the adhesion and corrosion resistance of acrylic was studied by EIS and LEIS.•Coating adhesion increased with the amount of MWCNTs and the law of it has been explained.The effects of multiwalled carbon nanotubes (MWCNTs) on the adhesion strength and corrosion resistance of the acrylic nanocomposite coatings were evaluated on Q235 substrates via pull-off tests and electrochemistry measurements (EIS, LEIS). Addition of MWCNTs to the acrylic resulted in an up to ∼50% increase in the adhesion strength. After 36 h of immersion in 3.5 wt% NaCl, the coating resistance of the native acrylic coating was 235.8 Ω cm2, whereas those of the nanocomposite coatings containing 0.5 and 1 wt% MWCNTs were 1.36 × 105 and 9.27 × 107 Ω cm2, respectively. LEIS analysis indicated that the addition of MWCNTs increased the adhesion strength and retarded the delamination. The results demonstrated the positive effects of the incorporation of MWCNTs on the anticorrosive ability of the coatings.
Co-reporter:Dongdong Song, Jin Gao, Xiaogang Li, Lin Lu
Polymer Testing 2014 Volume 33() pp:131-137
Publication Date(Web):February 2014
DOI:10.1016/j.polymertesting.2013.11.014
To evaluate the aging behavior of polypropylene (PP) under an aggressive environment, principal component analysis (PCA) was used to establish a non-dimensional expression Z from a data set of multiple properties of PP. In this study, PP specimens were subjected to natural exposure under the tropical environment on Xisha islands in China for different time periods. Chromatic aberration, gloss, tensile strength, elongation at break, flexural strength and impact strength were tested to evaluate the aging behavior of the PP. Principal component analysis (PCA) was then used to find a specific property to represent all properties of PP. The combined evaluation parameter Z of PP degradation showed no change for the initial two months of exposure. After a sharp increase, the value of Z increased gradually and finally leveled off for the last two months. Based on the Z values, the effect of solar radiation intensity on the degradation of PP is discussed.
