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Corrosion resistance properties of colored zirconium conversion coating and powder coating on cold-rolled steel

Rare Metals 2023年第3期42卷 1005-1010页

作者： Ai-Hua Wu Yao-Zu Wang Tong-Kuan Xu Zhi Li Sheng-Ji Luan Feng-Zuo Qu Shenzhen Key Laboratory of Environment Simulation and Pollution Control PKU-HKUST Shenzhen-HongKong InstitutionShenzhen 518057China Faculty of Light Industry and Chemical Engineering Dalian Polytechnic UniversityDalian 116034China

Jiuhe Corporation developed a new surface pretreatment for producing a phosphate-free and colored zirconium conversion coating on cold-rolled steel(CRS).Scanning electron microscopy(SEM)and energy-dispersive spectroscopy(EDS)were applied to study the surface morphology and elemental composition of the golden yellow-colored conversion *** trochemic al impedance spectroscopy(EIS)was used to investigate the electrochemical performance of the conversion coatings with different *** corrosion resistance properties of the powder coatings were characterized using the neutral salt spray test(NSS)and the tape adhesion *** EIS and NSS results demonstrate that the colored zirconium conversion coatings exhibit excellent corrosion resistance properties compared with the bare *** golden yellow-colored conversion coating has a maximum EIS value(748Ω·cm^(2))and achieves 0 mm degree of corrosion,as stipulated by EN ISO *** paper proposes a hypothesis concerning the ZrO_(2)-(β-FeOOH)-polymer conversion reaction to explain the color changes.

关键词： Surface pretreatment Colored conversion coating Zirconium oxide powder coating Corrosion protection

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coating powder beds with liquids and foams based on viscous formulations using a twin screw mixer:A continuous process study

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Particuology 2024年第10期93卷 364-376页

作者： Mohamed S.Manga Dimitrios Kontziampasis Mustafa Al-Maqdad Sean Clifford Serafim Bakalis David W.York School of Chemical and Process Engineering Faculty of Engineering and Physical SciencesUniversity of LeedsLeedsLS29JTUK School of Mechanical Engineering Faculty of Engineering and Physical SciencesUniversity of LeedsLeedsLS29JTUK School of Science and Engineering University of DundeeDD14HNDundeeScotlandUK Dundee International Institute of Central South University Tongzipo RoadCentral South UniversityChangshaHunan410013China Department of Chemical Engineering School of EngineeringUniversity of NewcastleNewcastleNE17RUUK School of Chemical Engineering University of BirminghamBirminghamB152TTUK Department of Chemical Engineering Faculty of EngineeringUniversity of NottinghamNG72RDUK

coating with viscous formulations has been essential in numerous industries as it can be a means for providing functionalization, additional properties, as well as other benefits. However, there have been scarce studies that have investigated and proposed methodologies in literature. Continuous coating of powders with viscous liquids poses as a promising technology, which has been mentioned in some studies, but has not yet been thoroughly investigated. This paper employs the use of image processing and analysis, in combination with statistical analysis of particles to evaluate the effectiveness of foams and liquids as a means of coating powder beds. Two different sizes of twin screw mixers that are working in continuous operation are employed, and a new continuous foaming device is fabricated and used for the experiments of coating. The effect of materials and process parameters (as for example rotational speed, and flowrate) on the quality of coating are investigated. Image analysis is used to assess the coating quality. The results clearly showcase the potential of using twin screw mixers for coating purposes and not only for mixing. The hypothesis that using large bubble foams to improve the coating of viscous liquids on particles is proven correct, as they provide higher quality coatings compared to their equivalent liquids, when used in the twin screw mixer. Surprisingly, using a larger scale twin screw mixer, does not show a substantial effect on the mixing, regarding quality, however there is still a requirement for mix optimization for achieving scale-up of this process. These results provide a new pathway for coating powders with viscous formulations in industrial applications, requiring less energy and effort in this process, and can pave the way towards introducing more sustainable industrial methodologies for coating.

关键词： powder coating Continuous processing Viscous liquid Foam Image analysis Positron emission particle traking(PEPT)

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A core-shell composite pigment with rutile TiO_(2) intensification for UV inhibition

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Particuology 2022年第8期20卷 18-26页

作者： Xiao Lv Baowei Yan Yuanyuan Shao Haiping Zhang Hui Zhang Jesse Zhu Cllaborative Innovation Center of Chemical Science and Engineering(Tianjin) School of Chemical Engineering and TechnologyTionjin UniversityTianjin 300350China Department of Chemical and Biochemical Engineering.Western Universiy Ontario N6A 589Canada

Organic pigments generlly have bright colors but poor ultraviolet(UV)*** improve the UV for UVinhibition is proposed by afacile sol-gel method inthis ***-shellstructure,witha homo resistance and extend the applications,a core-shell composite pigment with rutile Tio intensification geneous sol-gel TiO_(2) shell containing additional nanosized rutile TiO2 particles and with the pigment as the core,was established taking advantage of UV resistance of TiO2 and binding ability of *** the sol-gel TiO2 shell alone has already shown obvious ultraviolet shielding effect,as tested over different sol-gel aging times and Tio2 loadings,the UV resistance of the fluorescent pigments was further enhanced by binding the nanosized rutile TiO2 in the sol-gel shell At a sol-gel TiO2 to rutile TiO2 ratio of 2:1,the UV exposure time is extended about eight times compared with that of the original pigment and twice as that of the modifed pigment with pure sol-gel TiO2 for the same color ***,the novel core-shell composite pigment intensified with nanosized rutile Tio2 particles is proved to be effcient in improving the uV resistance of organic pigments.

关键词： Sol-gel RutileTiO_(2) Organic pigment Core-shell UV resistance powder coating

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coating particles using liquids and foams based on viscous formulations with industrial mixers: Batch operation

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Particuology 2020年第3期18卷 13-24页

作者： D.Kontziampasis M.S.Manga D.W.York School of Chemical and Process Engineering Faculty of EngineeringUniversity of LeedsLS29JTLeedsW.YorkshireUK

Particle or powder coating with viscous liquids has been essential in industry for surface modification purposes to induce and enhance specific *** paper evaluates the performance of using foams (of different bubble diameters) versus liquids as a means of coating powder beds based on viscous liquid *** with viscous liquids present numerous industrial challenges and therefore preparing foam equivalents can render the liquid component weak enough (through pre shearing to form the foam),to allow it to break up and coat particles under the shear forces exerted in a mixing *** this study,two shear mixers are used;the first type consists of paddles in different configurations attached to a single rotating shaft,whilst the second type is a commercial twin screw mixer (TSM).The quality of coating achieved on the bulk powder bed using liquids and foams (stained with a dye) is assessed by image analysis to determine the homogeneity of the color *** addition,scanning electron microscopy provides a tool to further investigate the coating quality of individual particles from the bulk *** results show that large bubble (centimeter size) foams are much more effective at distributing within the fluidized powder bed compared to the starting viscous liquid and small bubble foams (submillimeter size).Furthermore,there is a maximum ratio of foam to powder beyond which agglomeration occurs and is insufficient to fully coat the *** of individual particles is achieved in the case of the TSM,whereas SEM proves that the single shaft paddle mixer crushes the particles and subsequently granulates them together to form granules of a size comparable to the size of coated particles seen after coating with the TSM.

关键词： powder coating Viscous liquid Foam Image analysis Foam rheology Surface modification

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SEMI-CRYSTALLINE PROPERTIES AND PHOTOPOLYMERIZATION KINETICS OF MODIFIED DENDRITIC POLY（ETHER-AMIDE）

SEMI-CRYSTALLINE PROPERTIES AND PHOTOPOLYMERIZATION KINETICS...

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The 8th International Conference on Radiation Curing

作者： Wei Huanyu Kou Huiguang Shi Wenfang Department of Applied Chemistry University of Science and Technology of China Hefei Anhui 230026 P. R. China

＜正＞The dendritic poly （ether-amide）（DPEA-OH） was modified with octadecyl . isocyanate, toluene-2,4-diisocyanate and β -hydroxylethyl acrylate, producing a UV curable resin with crystalline molecular shell and amorphous interior. The ratio of these modifiers can adjust the products’ final properties to fulfil the requirements of UV curable powder coatings. The degree of crystallinity is higher with more crystallizable moieties grafted from the XRD measurements. The crystallizable resins obtained have a Tg of 41- 45℃ and a Tm of around 120℃. Their photopolymerization kinetics was also investigated.

关键词： powder coating Dendritic poly (ether-amide) Curing kinetics Semi-crystallinity

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不同固化体系对环氧粉末涂料性能的影响

不同固化体系对环氧粉末涂料性能的影响

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2010年全国高分子材料科学与工程研讨会

作者：韩俊华吕建徐晓伟白亚飞王冰桂林理工大学材料科学与工程学院有色金属及材料加工新技术教育部重点实验室

环氧粉末涂料是一种公认的高生产效率、优良涂膜性能、生态环保型、经济型的4E型涂料产品。一般粉末涂料的固化条件大多是温度170～200℃,个别高达200℃,时间20～30min,存在烘烤温度较高,时间较长的缺点。如何有效降低粉末涂料的固化温... 详细信息

环氧粉末涂料是一种公认的高生产效率、优良涂膜性能、生态环保型、经济型的4E型涂料产品。一般粉末涂料的固化条件大多是温度170～200℃,个别高达200℃,时间20～30min,存在烘烤温度较高,时间较长的缺点。如何有效降低粉末涂料的固化温度,减少固化时间,一直是

关键词： epoxy resin powder coating curing system

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