| DENG Liang,LIN Cun-guo,ZHANG Jin-wei,MA Li,SU Yan,CHENG Xu-dong,SHAO Gang-qin,WANG Li.Service Life Model and Indoor Accelerated Evaluation Method of Fouling-release Coatings[J],51(5):293-303 |
| Service Life Model and Indoor Accelerated Evaluation Method of Fouling-release Coatings |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.05.030 |
| KeyWord:fouling release coating shallow sea hanging board grey relational analysis accelerated aging test correlation failure mechanism |
| Author | Institution |
| DENG Liang |
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan , China;State Key Laboratory for Marine Corrosion and Protection, Qingdao Branch of Luoyang Ship Material Research Institute LSRMI, Shandong Qingdao , China |
| LIN Cun-guo |
State Key Laboratory for Marine Corrosion and Protection, Qingdao Branch of Luoyang Ship Material Research Institute LSRMI, Shandong Qingdao , China |
| ZHANG Jin-wei |
State Key Laboratory for Marine Corrosion and Protection, Qingdao Branch of Luoyang Ship Material Research Institute LSRMI, Shandong Qingdao , China |
| MA Li |
State Key Laboratory for Marine Corrosion and Protection, Qingdao Branch of Luoyang Ship Material Research Institute LSRMI, Shandong Qingdao , China |
| SU Yan |
Southwest Institute of Technology and Engineering, Chongqing , China |
| CHENG Xu-dong |
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan , China |
| SHAO Gang-qin |
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan , China |
| WANG Li |
State Key Laboratory for Marine Corrosion and Protection, Qingdao Branch of Luoyang Ship Material Research Institute LSRMI, Shandong Qingdao , China |
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| Abstract: |
| Based on the shallow sea siding test of typical fouling-releasing antifouling coatings, the variation law of antifouling performance and key antifouling characteristic parameters with sea immersion time was investigated, and a service life model of fouling-releasing antifouling coatings was constructed. The critical value of the key antifouling characteristic parameters of the coating was calculated, and the artificial accelerated aging evaluation method of the antifouling coating was established based on this. According to the test method specified in GB/T 5370—2007 Method for Testing Antifouling Panels in Shallow Submergence, two-year shallow sea siding tests on two fouling-releasing coatings-Intersleek series and FRC-725, were carried out in three sea areas of Qingdao, Xiamen and Sanya. Parameters such as surface energy, roughness, hardness, Si—CH3/Si—O—Si ratio, and antifouling performance scores of the two coatings were collected every six months. The grey relational analysis was used to establish the mathematical model of the service life of the antifouling coating. The correlations between surface energy, roughness, hardness, Si—CH3/Si—O—Si ratio and antifouling performance scores were calculated by grey correlation analysis. According to the actual situation, three factors of surface energy, roughness and Si—CH3/Si—O—Si ratio were selected to fit the service life models of the two fouling-releasing coatings and mathematical equation was given. The theoretical value of service life of Intersleek series fouling release coating was calculated by mathematical equation, compared with the actual service life and the relative error between them was calculated to evaluate the feasibility of the life equation. At the same time, the critical value of the parameters when the FRC-725 coating fails was calculated, and the artificial accelerated aging test was designed based on this. The performance data of the FRC-725 coating after artificial accelerated aging were collected and compared with the data obtained from the shallow sea siding, the correlation between the two was analyzed, and the acceleration factor between the artificial accelerated aging test and the shallow sea siding test was calculated. In addition, the change of the surface composition of the FRC-725 coating before and after aging was analyzed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, and the failure mechanism of the coating was studied. The results show that the artificial accelerated aging test has a good correlation with the test results obtained from the shallow sea siding test. Through mathematical analysis, the life model of Intersleek series coating is:Y1=2 618.103[1.186ln(t+0.569)+25.667]–0.803 [1.16ln(t–0.129)+ 2.92]–0.029[0.736(t+0.067)–0.008 7]2.45; The relative error between the theoretical value and the actual value of the antifouling period calculated by this equation is 4%. The life model of FRC-725 coating is:Y2=1 609.597[0.225ln(t–0.465)+25.437]–0.495[0.652ln(t– 0.302)]0.128[0.736(t+0.44)–0.017]4.435. It is calculated that the critical surface energy when the FRC-725 coating fails is 25.89 mJ/m2, the critical roughness is 4.11 μm, and the critical Si—CH3/Si—O—Si ratio is 0.710. Based on the coating surface energy, roughness, Si—CH3/Si—O—Si ratio test, it can be concluded that the artificial accelerated aging of 1 h is equivalent to the level of 0.1 years of shallow sea hanging boards. Fourier infrared spectroscopy analysis shows that during the aging process of the coating, the main chain of macromolecules is degraded, and the hydrophobic groups such as —CH3 on the surface of the coating are oxidized and broken to form hydrophilic groups such as —OH. X-ray photoelectron spectroscopy analysis showes that the organic silicon indicated by the coating is oxidized, forming a dense inorganic silicon oxide layer. |
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