Life evaluation of organic coatings on hydraulic metal structures

Zhang, Zehui; Wu, Jin; Zhao, Xiaoting; Zhang, Yongsheng; Wu, Yaming; Su, Tian; Deng, Huachao

doi:10.1016/j.porgcoat.2020.105848

Cited by 14 publications

(7 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The SEM morphology shows that the surface of t 2 coating is smooth at the beginning, but as the solution diffuses, and especially un cyclic high and low temperature action, some micro-cracks and tiny holes soon ap the surface of the coating. This can be seen in Figure 4b, which shows via digita microscope that microcracks had appeared on the coating surface after 20 days These micro-cracks and holes cause an increase in the surface roughness and le rapid drop in gloss [46,47,48,49]. The gloss of the FW-2 coating does not chang after 20 days of immersion, which is consistent with the surface micromorphology in Figure 4.…”

Section: Glossiness and Color Difference Analysis Of Two Coating Samplessupporting

confidence: 74%

Degradation of Two Anti-Corrosion and Anti-Fouling Coating Systems in Simulated Diurnal Cycling Immersion

et al. 2023

View full text Add to dashboard Cite

The degradation process and the electrochemical behavior of two anti-corrosion and anti-fouling coating systems (FW-1 and FW-2) in a simulated diurnal cycling immersion environment (3.5% NaCl, 35 °C 12 h + 25 °C 12 h) were investigated by electrochemical impedance spectroscopy (EIS) technology. Combined with the coating gloss, color difference, adhesion strength and scanning electron microscopy (SEM) tests, the micro morphologies and the variations of the performance parameters were comparatively analyzed. The results showed that in the 160 days of immersion, with the hydrolysis of the FW-1 topcoat resin and some pigments dissolved and released, the surface micro-morphology of the coating changes from rough to smooth, thereby increasing the gloss. While, for the FW-2 topcoat, the occurrence of micro pores and tiny cracks results in an increase in the roughness and a decrease in the gloss. The release of the copper ion particles in the antifouling topcoat has an influence on the color, manifesting as obvious rise in the color difference of the coating. The low-frequency impedance (|Z|0.01 Hz) values of both coating samples decreases slowly and provides very good shielding to the carbon steel substrate. The self-polishing of the topcoat has no big effect on the electrochemical performance of the whole anti-corrosion and anti-fouling coating system; the protective performance of the coating system mainly depends on the integrity of the primer and the intermediate paint.

show abstract

Section: Glossiness and Color Difference Analysis Of Two Coating Samplessupporting

confidence: 74%

Degradation of Two Anti-Corrosion and Anti-Fouling Coating Systems in Simulated Diurnal Cycling Immersion

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Nowadays, coating protection performance is usually evaluated according to the following coating characteristics: The physical and chemical changes, such as the gloss loss (Guseva et al , 2003; Evans, 2012), the color change (Lee and Chang, 2016), the emergence of rust (Kim and Itoh, 2007), the adhesion failure (Zhang et al , 2020a; Zhang et al , 2020b; Meng et al , 2017) and the occurrence of blistering (Latif et al , 2017; Chuang and Nguyen, 1997; Bethencourt et al , 2004; Xu et al , 2021; Zheng et al , 2021). The electrochemical resistance reduction, such as the decreased coating resistance (Cmaitland and Mayne, 1962; Deflotian et al , 2008; Yong et al , 2021) and the reduced low frequency modulus (Bierwagen et al , 2001; Shreeoathi et al , 2011; Su et al , 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The physical and chemical changes, such as the gloss loss (Guseva et al , 2003; Evans, 2012), the color change (Lee and Chang, 2016), the emergence of rust (Kim and Itoh, 2007), the adhesion failure (Zhang et al , 2020a; Zhang et al , 2020b; Meng et al , 2017) and the occurrence of blistering (Latif et al , 2017; Chuang and Nguyen, 1997; Bethencourt et al , 2004; Xu et al , 2021; Zheng et al , 2021).…”

Section: Introductionmentioning

confidence: 99%

Prediction of long-term service life of an organic coating based on short-term exposure results

Song

Zheng

2022

ACMM

View full text Add to dashboard Cite

Purpose This study aims to provide a model to predict the service life of a thick organic coating. Design/methodology/approach A series of thin coating films are rapidly tested under the same exposure condition as the thick coating in its service condition by means of electrochemical impedance spectroscopy, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Findings The validity of the model is successfully verified. The long-term protectiveness or service life of a thick organic coating can be rapidly predicted. Originality/value The prediction model does not require long-term experiments or any test that may alter the degradation mechanism of the thick coating.

show abstract

“…As an effective barrier to corrosion media, organic coating is one of the most popular corrosion protection approaches [1][2][3][4][5][6][7][8]. Since organic coating is usually more protective and relatively low cost, and can be more easily applied to large structures than other coating techniques, it is often the first option, particularly for heavy-duty anti-corrosion [9,10] in marine environments [11,12], where many factors, such as solar radiation, high salinity, hot-cold alternation, wet-dry cycling and micro and macro living species, can significantly exacerbate the environment corrosivity and dramatically accelerate the coating degradation [13,14].…”

Section: Introductionmentioning

confidence: 99%

Modification, Degradation and Evaluation of a Few Organic Coatings for Some Marine Applications

Song

Feng

2020

CMD

View full text Add to dashboard Cite

Organic coatings for marine applications must have great corrosion protection and antifouling performance. This review presents an overview of recent investigations into coating microstructure, corrosion protection performance, antifouling behavior, and evaluation methods, particularly the substrate effect and environmental influence on coating protectiveness, aiming to improve operational practice in the coating industry. The review indicates that the presence of defects in an organic coating is the root cause of the corrosion damage of the coating. The protection performance of a coating system can be enhanced by proper treatment of the substrate and physical modification of the coating. Environmental factors may synergistically accelerate the coating degradation. The long-term protection performance of a coating system is extremely difficult to predict without coating defect information. Non-fouling coating and self-repairing coatings may be promising antifouling approaches. Based on the review, some important research topics are suggested, such as the exploration of rapid evaluation methods, the development of long-term cost-effective antifouling coatings in real marine environments.

show abstract

Life evaluation of organic coatings on hydraulic metal structures

Cited by 14 publications

References 35 publications

Degradation of Two Anti-Corrosion and Anti-Fouling Coating Systems in Simulated Diurnal Cycling Immersion

Degradation of Two Anti-Corrosion and Anti-Fouling Coating Systems in Simulated Diurnal Cycling Immersion

Prediction of long-term service life of an organic coating based on short-term exposure results

Modification, Degradation and Evaluation of a Few Organic Coatings for Some Marine Applications

Contact Info

Product

Resources

About