scholarly journals Anticorrosion Property of Alcohol Amine Modified Phosphoric and Tannic Acid Based Rust Converter and Its Waterborne Polymer-Based Paint for Carbon Steel

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1091
Author(s):  
Yang Chen ◽  
Shiyu Li ◽  
Zhiyong Liu ◽  
Zixiao Wang
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Tannic Acid ◽  
Iron Phosphate ◽  
Anticorrosion Property ◽  
Rust Layer ◽  
Passivation Film ◽  
Film Layer ◽  
Main Components

Four kinds of alcohol amines were tested to improve the anticorrosion performance of the phosphoric and tannic acid (PTA)-based rust converter. The alcohol amine modified PTA rust converters with the optimum mechanical and functional performances were used to prepare the homogeneous single-component waterborne rust conversion-based paint. The mechanical properties and the long-term corrosion resistance of the synthesized rust converter-based paint were investigated. The results show that alcohol amine modified PTA rust converter can convert the rust layer into a thick passivation film with iron tannate and iron phosphate as the main components, significantly improving the corrosion resistance of the carbon steel. The alcohol amine D modified PTA rust converter (RC-D) showed the best anticorrosion and rust conversion performances. The waterborne rust conversion-based paint can convert the rust layer of steel into a blue-black and relatively flat passivation film layer. The waterborne polymer-based paint containing 10 wt.% RC-D significantly improves the long-term corrosion resistance of the rusty steel and the mechanical property of paint.

A Study on the Weatherability of Weathering Steel after Atmospheric Corrosion

2012 ◽  
Vol 479-481 ◽  
pp. 574-577
Author(s):  
Zhi Fen Wang ◽  
Jian Rong Liu ◽  
Li Xin Wu ◽  
Hai E Huang ◽  
Qian Xue Zhou
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Atmospheric Corrosion ◽  
Alloying Elements ◽  
Weathering Steel ◽  
Rust Layer ◽  
Copper Chromium

The weatherability of a weathering steel W450QN was compared with a carbon steel Q345 after 5 years atmospheric corrosion. The results indicated that the corrosion resistance was better for W450QN than Q345 based on the corrosion rate. The characteristics of the rust layers indicated the rust layer on W450QN was denser and thicker than that of Q345. The rust layers were mainly composed of goethite (α-FeOOH) with a few of lepidocrocite (γ-FeOOH). W450QN had better weatherability attributed to the alloying elements of copper, chromium and phosphorus enriched in the rust layer.

scholarly journals Interactions between Phosphoric/Tannic Acid and Different Forms of FeOOH

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Lefu Mei ◽  
Libing Liao ◽  
Zise Wang ◽  
Chunchun Xu
Keyword(s):  
Tannic Acid ◽  
Photoelectron Spectroscopy ◽  
Iron Phosphate ◽  
Reaction Products ◽  
X Ray Diffraction ◽  
Rust Layer ◽  
X Ray ◽  
Ferric Oxides ◽  
Alpha Beta ◽  
Technical Basis

Alpha, beta, gamma, and delta hydroxyl ferric oxides (FeOOH), as the most common rust layers on iron surface, play different roles in iron preservation. Using modern surface analysis technologies such as X-ray diffraction (XRD), infrared spectra (IR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM), we studied the interactions between these four types of synthetic FeOOH and phosphoric and tannic acid of different concentrations and proportions. A 3% tannic acid + 10% phosphoric acid + FeOOH was the most suitable formula for rust stabilizer and its reaction products were made up of iron phosphate and chelate of iron and tannin. This research provided technical basis in distinguishing FeOOH and selecting rust layer stabilizer for the preservation of iron, especially iron cultural relics.

An electrochemical method based on OCP fluctuations for anti-corrosion alloy composition optimization

2018 ◽  
Vol 65 (3) ◽  
pp. 325-330 ◽  
Author(s):  
Mindong Chen ◽  
Huijie Zhang ◽  
Liang Chen ◽  
Dongmei Fu
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Method ◽  
Alloy Composition ◽  
Open Circuit ◽  
Carbon Steels ◽  
Rust Layer ◽  
Content Type ◽  
Potential Fluctuations ◽  
Composition Optimization

Purpose An electrochemical method based on the open circuit potential (OCP) fluctuations was put forward. It can be used to optimize the alloy compositions for improving the corrosion resistance of rust layer. Design/methodology/approach The potential trends and potential fluctuations of carbon steels in seawater were separated by Hodrick–Prescott filter. The Spearman correlation coefficient and max information coefficient were used to explore the correlation of alloy compositions and potential fluctuations. Findings After long-term immersion, potential fluctuation resistance (PFR) can be used to characterize the corrosion resistance of metals and its rust layers. In the 1,500 to 2,500 h exposure period, Fe, C and S compositions have strong negative correlations, whereas PFR and P composition have weak negative correlations. Mn, Cu and Ti alloy compositions help the rust layer of carbon steels have higher PFRs. These elements that exhibit higher PFRs in this period have been confirmed to have the effect on improving the corrosion resistance of rust layer. Originality/value A new computing method for alloy composition optimization of carbon steels based on the OCP fluctuations was put forward. This method combines electrochemical monitoring with the long-term actual seawater environmental tests of various carbon steels.

Investigation of the Corrosion Resistance of Weathering Steel at Different Atmospheric Environment

2012 ◽  
Vol 629 ◽  
pp. 240-244
Author(s):  
Zhi Fen Wang ◽  
Jian Rong Liu ◽  
Li Xin Wu ◽  
Yi Qiang Sun ◽  
Rong Dong Han
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Atmospheric Corrosion ◽  
Atmospheric Environment ◽  
Weathering Steel ◽  
Rust Layer ◽  
Corrosion Rates ◽  
Two Cities ◽  
Environment Factor

The corrosion resistances of a weathering steel SPA-H and a carbon steel Q345 after atmospheric corrosion rests of two cities were measured. The results showed that the corrosion resistance was better for SPA-H than Q345 based on the corrosion rate. The corrosion rates of two steels at Qionghai city were lower than those of Jiangjin city. The characterization of the rusts showed the rust layer on SPA-H was denser and thinner than that of Q345. The rust layers were mainly composed of goethite (α-FeOOH) with a few of lepidocrocite (γ-FeOOH). SPA-H had better weatherability attributed to the alloying elements of copper, chromium and phosphorus enriched in the rust layer. The environment factor such as the sedimentation of SO2 has more effect on the corrosion rates than other factors such as alloy elements.

Study on the effect of surface tannic acid/silane conversion film on properties of epoxy resin coatings

2019 ◽  
Vol 66 (4) ◽  
pp. 446-453
Author(s):  
Tianji Xing ◽  
Lixia Ying ◽  
Chunxi Wu ◽  
Zhen Fu ◽  
Guixiang Wang
Keyword(s):  
Corrosion Resistance ◽  
Epoxy Resin ◽  
Tannic Acid ◽  
Steel Surface ◽  
Steel Substrate ◽  
Sodium Molybdate ◽  
Content Type ◽  
Binding Force ◽  
Main Components ◽  
Effect Of Surface

Purpose The purpose of this paper is to improve binding force between the coating and the steel substrate by using chemical modification on the steel surface; at the same time, it can also increase the corrosion resistance of the coating. Design/methodology/approach The main components of the conversion film include tannic acid, sodium molybdate and silane coupling agent KH560. After the preparation was completed, the samples were tested and analyzed, including surface morphology, conversion film components, bonding force with organic resins and corrosion resistance. Finally, it drew a conclusion that the conversion film can greatly improve the bonding strength of the steel substrate and epoxy resin. Findings When the content of tannic acid is 4 g/L meanwhile the content of KH560 is 20 g/L, the conversion film has the strongest binding force with epoxy resin, from 2.15 Mpa of untreated steel to 4.60 Mpa, growth of 140 per cent. At the same time, the resulting conversion film also improves the corrosion resistance of the steel surface by a small margin. Originality/value A method of enhancing the bond between an epoxy coating and steel is provided. Verify the mechanism of this method.

Corrosion Resistance of a Gradient Surface with Cr Alloying on Low-Carbon Steel

2017 ◽  
Vol 898 ◽  
pp. 826-831
Author(s):  
Y. Yao ◽  
X.Y. Mao ◽  
L.J. Shao ◽  
H. Chen ◽  
H.Y. Yang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Corrosion Current Density ◽  
Corrosion Potential ◽  
Low Carbon Steel ◽  
Corrosion Current ◽  
Low Carbon ◽  
Passivation Film ◽  
The Impact ◽  
Gradient Surface

As compared with the untreated one, the low-carbon steel with gradient alloying produced by impact peening showed an increase in corrosion resistance. Specifically, when the corrosion potential increased from-1061 mV to-603.5 mV, the corrosion current density decreased from 1.579×10-3 A/cm2 to 6.703×10-4 A/cm2, the capacitive arc radius increased, and there was no corrosion products viewed on the surface. The improvement in corrosion resistance could be attributed to the diffusion of Cr allowed by the large number of defects induced by the impact peening deformation. This also resulted in the formation of Fe-Cr solid solution, which helped to promote the formation of a passivation film.

scholarly journals Defining-Measuring-Analysing-Improving-Controlling (DMAIC): Process and Improve Stability in Carbon Steel Industry

2021 ◽  
Vol 2129 (1) ◽  
pp. 012029
Author(s):  
M S Ishak ◽  
M S Jusoh ◽  
A G M Rosli ◽  
D H M Yusuf ◽  
M S Ismail
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Steel Industry ◽  
Zinc Phosphate ◽  
Iron Phosphate ◽  
Phosphate Coating ◽  
Excellent Corrosion Resistance ◽  
Materials Used ◽  
Dmaic Method ◽  
Lubricating Properties

Abstract Phosphating is most common method for surface treatment and finishing of ferrous and nonferrous metal. It has excellent corrosion resistance, wear resistance, adhesion and lubricating properties besides its economic values and speed of application. Steel is one of the cheapest materials used in various industries and it requires corrosion resistance therapy. This study aims to provide possible solution to the rusty issue on carbon steel product by improving coating stability using Defining–Measuring–Analysing–Improving–Controlling (DMAIC) method. The result proposed that zinc phosphate coating material has to replace current iron phosphate coating due to the former is more corrosion time resistant than that of the latter.

Corrosion characterization of phosphated carbon steel treated with benzotriazole

2015 ◽  
Vol 62 (6) ◽  
pp. 379-387
Author(s):  
Cristiane Spagnol ◽  
Everson do Prado Banczek ◽  
Isolda Costa ◽  
Maico Taras Cunha ◽  
André Lazarin Gallina ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Electrochemical Impedance ◽  
Iron Phosphate ◽  
Post Treatment ◽  
Phosphate Coating ◽  
Content Type ◽  
Phosphate Layer ◽  
Study Results

Purpose – The purpose of the paper is to show the corrosion effect of benzotriazole in comparison with iron phosphate (PFe) coating as a sealer for the PFe layer in carbon steel paint pre-treatment and to show its ecological advantages as a more environment-friendly inhibiting compound than PFe. Design/methodology/approach – Samples of carbon steel (SAE 1010) were phosphated in two baths, one containing iron PFe and PFe and BTAH (PFe + BTAH). Anodic potentiostatic polarization curves and electrochemical impedance spectroscopy were used to evaluate the corrosion resistance of phosphated carbon steel in 0.1 molL−1 H2SO4, 0.5 molL−1 NaCl and 0.1 molL−1 NaOH. The phosphate layers obtained were analyzed by infrared spectroscopy. Surface observation by scanning electron microscopy (SEM) showed that the PFe and PFe + BTAH layers are deposited as crystals with granular morphology. The electrochemical results showed that the PFe + BTAH coating was more effective in corrosion protection of the carbon steel. Findings – This paper presents the application of benzotriazole as post-treatment of PFe-coated carbon steel. The results show that benzotriazole improves the phosphate layer properties. The SEM micrographs showed that the layer formed in PFe and PFe + BTAH baths consists of grain-like crystals, and infrared results revealed the BTAH presence in PFe phosphate. The corrosion resistance results showed higher efficiency associated to the PFe + BTAH phosphate layer relative to that of PFe. From the present study, results can be concluded that BTAH can be used as a post-treatment for PFe phosphate coating. Originality/value – This paper deals with the corrosion resistance and surface carbon steel characterization of a new sealer for PFe coating, which has been prepared for this study and was never tested previously. These are candidate materials for substitution of chromium sealer. The BTAH sealer presents environmental and corrosion resistance advantages when compared with the post-treatment based on chrome. Although BTAH improves PFe layers’ properties, it is the worst phosphate coating. This manuscript has never been previously submitted and deals with original results.

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