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Keywords = phosphate coatings on rolled steel

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13 pages, 3529 KB  
Article
The Formation of Phytic Acid–Silane Films on Cold-Rolled Steel and Corrosion Resistance
by Wanjiao Duan, Yunying Fan, Baipo Shu, Yichun Liu, Yi Wan, Rongguang Xiao, Jianxin Xu, Shan Qing and Qingtai Xiao
Metals 2024, 14(3), 326; https://doi.org/10.3390/met14030326 - 12 Mar 2024
Cited by 5 | Viewed by 2473
Abstract
In this work, phytic acid (PA) and 3-mercaptopropyltrimethoxysilane (MPTS) underwent a condensation process to produce a phytic acid–silane (abbreviated PAS) passivation solution. Additionally, it was applied to the surface of cold-rolled steel to create a composite phytic acid–silane film. The functional groups of [...] Read more.
In this work, phytic acid (PA) and 3-mercaptopropyltrimethoxysilane (MPTS) underwent a condensation process to produce a phytic acid–silane (abbreviated PAS) passivation solution. Additionally, it was applied to the surface of cold-rolled steel to create a composite phytic acid–silane film. The functional groups of the passivation solution were analyzed by Fourier transform infrared spectroscopy (FT-IR). The composite film was evaluated using an electrochemical workstation, scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS) and pull-off test. These techniques allowed for the characterization of the film’s micromorphology, oxidation, chemical composition and adhesion strength. The results show that the PAS composite film provides higher protection efficiency compared to cold-rolled steel substrates, low phosphorus passivation films, single phytate passivation films and commercial phosphate films. This composite film also has a higher adhesion strength, which is beneficial for subsequent coating, and a possible corrosion resistance mechanism was proposed as well. The PAS layer successfully prevents the penetration of corrosive media into the cold-rolled steel surface utilizing P–O–Fe bonds, thus improving the corrosion barrier effect of the substrate. Full article
(This article belongs to the Special Issue Environmentally-Assisted Degradation of Metals and Alloys)
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8 pages, 3446 KB  
Article
Influence of the Laser Deposited 316L Single Layers on Corrosion in Physiological Media
by Unai Garate, Enara Mardaras, Rodolfo González, Jon Iñaki Arrizubieta, Garikoitz Artola and Javier Aldazabal
Metals 2022, 12(6), 1047; https://doi.org/10.3390/met12061047 - 19 Jun 2022
Cited by 1 | Viewed by 2357
Abstract
A multilayer laser-deposited lining of AISI 316L stainless steel makes a regular structural steel surface corrosion resistant in physiological media. Despite the application of single-layer stainless-steel linings being economically beneficial and allowing thinner surface modifications, dilution effects that modify the pitting resistance of [...] Read more.
A multilayer laser-deposited lining of AISI 316L stainless steel makes a regular structural steel surface corrosion resistant in physiological media. Despite the application of single-layer stainless-steel linings being economically beneficial and allowing thinner surface modifications, dilution effects that modify the pitting resistance of the coating must be accounted for. In order to study the feasibility of employing single-layer coatings instead of multilayer coatings for corrosion protection in physiological media, a polarization testing back-to-back comparison was performed between laser-deposited AISI 316L monolayers on 42CrMo4 quenched and tempered steel and cold-rolled AISI 316L sheet in Dulbecco’s Phosphate Buffer Solution at 36 °C. A higher dispersion in pitting resistance, ranging from 800 mV to 1200 mV, was found on the coated samples, whereas the cold-rolled material was more stable in the 1200 mV range. The resulting differences in corrosion rates and pitting potentials open the discussion on whether the chemical composition deviations on AISI 316L dilution layers are acceptable in terms of surface functionality in medical devices. Full article
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10 pages, 2160 KB  
Article
Application of Industrial XRF Coating Thickness Analyzer for Phosphate Coating Thickness on Steel
by Aleksandr Sokolov, Jelena Hasikova, Aleksej Pecerskis, Vladimir Gostilo, Ki Yong Lee, Hoobok Jung and Jung Hyun Lim
Coatings 2018, 8(4), 126; https://doi.org/10.3390/coatings8040126 - 30 Mar 2018
Cited by 3 | Viewed by 10133
Abstract
The results of industrial application of an online X-ray fluorescence coating thickness analyzer for measuring the thickness of phosphate coatings on moving steel strips are considered in the article. The target range of coating thickness to be measured is from tens to hundreds [...] Read more.
The results of industrial application of an online X-ray fluorescence coating thickness analyzer for measuring the thickness of phosphate coatings on moving steel strips are considered in the article. The target range of coating thickness to be measured is from tens to hundreds of mg/m2 in a measurement time of 10 s. The measurement accuracy observed during long-duration factory acceptance test was 10–15%. The coating thickness analyzer consists of two XRF gauges, mounted above and below the steel strip and capable of moving across the moving strip system for their suspension and relocation and electronic control unit. Fully automated software was developed to automatically and continuously (24/7) control both gauges, scanning both sides of the steel strip, and develop and test methods for measuring new coatings. It allows performing offline storage and retrieval of the measurement results, remotely controlling the analyzer components and measurement modes from a control room. The developed XRF coating thickness analyzer can also be used for real-time measurement of other types of coatings, both metallic and non-metallic. Full article
(This article belongs to the Special Issue Advanced Nondestructive Evaluation and Characterization of Surface)
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