Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract: A rust converter coating, using vinyl chloride- acrylic copolymer as film- forming substance and phosphoric acid as rust converter, was prepared on a rust Q235 carbon steel. Then the influence of the mass fraction of phosphoric acid on the coating performance was studied by means of salt spray tests and electrochemical impedance spectroscopy (EIS). The reaction of phosphoric acid with the rust was examined through microscopic analysis of the surface morphology of the coating. The results showed that phosphoric acid can react with the lepidocrocite in the rust, forming a dense conversion layer on the steel. When the mass fraction of phosphoric acid in the coating is 10%, the property of the conversion layer showed better corrosion resistant performance than other coating samples with lower mass fraction of phosphoric acid.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: Cold galvanizing coatings were prepared. The coating properties were characterized by salt spray test and electrochemical impedance spectroscopy. Among others, the coating with 95.2% (mass fraction) Zn exhibits the highest corrosion resistance to salt spray, and its corrosion product consists of ZnO and Zn(OH)2. When the Zn content is less than 75%, the impedance of coatings in the solution of 3%(mass fraction) NaCl decreases with the increasing immersion time, and thus the coatings provide inferior protectiveness; when the Zn content is greater than 75%, the impedance of the coating decreases firstly and then increases with the increasing time, which may be ascribed to that the Zn powder in the coating acts as sacrificial anode,which was preferentially corroded in the initial statge.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: A nanocomposite coating was prepared with epoxy resin as film-forming agent,polysiloxane as coupling agent and with proper additives of pigments, fillers and nano silicon dioxide. The nanocomposite coating was applied on carbon steel Q235, and its corrosion performance, in comparison with a present used coating, was investigated by means of simulate acid rain test, immersion test and electrochemical impedance spectroscopy. Results showed corrosion resistance of the nanocomposite coating is better than that of the current coating, it is suitable especially for the protection of engineering steel components for electric power facilities.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: Nanocomposite epoxy coatings were prepared with different proportion of epoxy resin and inhibitor- grafted montmorillonite. The effect of the inhibitor- grafted montmorillonite on the corrosion resistance of epoxy coating on hot dip galvanized steel sheet was investigated by using salt spray tests and electrochemical impedance spectroscopy (EIS). The results show that among the coatings tested, the one with 3% of the inhibitor-grafted MMT exhibits the most superior corrosion resistance with water diffusion coefficient of 9.89×10-11 cm2/s and porosity of 2.22×10-8 respectively; while its impedance values is above 109 Ω·cm2 during the whole immersion times.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract: Nano-flake barium phosphate was prepared by hydrothermal synthesis, and then the effect of which as pigment on the corrosion behavior of epoxy coating was investigated by means of electrochemical impedance spectroscopy (EIS) and salt spray tests. The results show that the nano-flake barium phosphate in the epoxy coating can react with iron oxide, the corrosion product of metal substraste, to generate an insoluble FePO4 as a barrier on the corrosion spot, thereby to enhance the corrosion resistance of the coating; Among others, an epoxy coating with 5 mass% nano flake barium phosphate shows the highest corrosion resistance.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract: Polyurethane coatings with two kinds of sillitin, i.e. M type and Z type sillitin respectively as filler were prepared and sprayed on hot dip galvanized steel sheets. The coatings exhibited better mechanical properties than the simple polyurethane coating, i.e. the wear resistance and the hardness of the polyurethane coating may be enhanced by 57.1% and 14.5%, as well as 85.7% and 41.8% for the addition of M type and Z type sillitin respectively. The coatings with the two types of sillitin exhibited also better corrosion resistance. The reason is that two types of sillitin are of a special structure composed of micro- sized granular silica and nano- flake kaolin clay, and the sillitin possesses high amount of nanoflake, which may be beneficial to the enhancement of the permeation resistance and mechanical properties of the coatings.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract: The influence of flaky nickel powder as pigment on the permeation resistance of fluorocarbon based coatings was investigated by salt spray tests, EIS tests and measurement of water vapor transmission rate. The results show that among others the coating with a volume fraction 5% of flaky nickel powder exhibited the best comprehensive performance, however its resistance to water permeation degraded greatly for the coating with higher volume fraction of flaky nickel powder up to 15%.
Subjects: Materials Science >> Materials Science (General) submitted time 2017-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract:通过对比商业化的抑制剂颜料铬酸锶和改性多聚磷酸锶铝,研究了新型绿色抑制剂颜料-肉桂酸铈对轨道交通用7XXX铝合金的腐蚀抑制行为和含肉桂酸铈环氧涂层的腐蚀防护行为。浸泡实验的结果表明,肉桂酸铈和铬酸锶对铝合金的腐蚀具有优秀的抑制作用。极化曲线(PDS)的结果表明,改性多聚磷酸锶铝在浸泡初期对铝合金具有较强的腐蚀抑制能力,而这种腐蚀抑制能力在浸泡后期弱于肉桂酸铈和铬酸锶。研究了含有1%(wt.%)以上三种抑制剂颜料环氧漆的腐蚀行为,电化学交流阻抗谱(EIS)结果表明,含有1%肉桂酸铈的环氧涂层具有优秀的腐蚀防护能力。