Long-Term Dual Cathodic Protection for Q235 Carbon Steel by Co(OH)2/Graphene/TiO2 Photocatalytic Material and Traditional Sacrificial Anode

2020 ◽  
Vol 167 (13) ◽  
pp. 131509
Author(s):  
Xiayu Lu ◽  
Li Liu ◽  
Xuan Xie ◽  
Yu Cui ◽  
Fuhui Wang
Keyword(s):  
Carbon Steel ◽  
Cathodic Protection ◽  
Sacrificial Anode ◽  
Q235 Carbon Steel ◽  
Photocatalytic Material

Design of New Al Photoanode Composite for Cathodic Protection Based on Photocatalytic Material and Sacrificial Anode

2019 ◽  
Vol 166 (5) ◽  
pp. H3215-H3222 ◽  
Author(s):  
Xuan Xie ◽  
Li Liu ◽  
Runze Chen ◽  
Gang Liu ◽  
Ying Li ◽  
...  
Keyword(s):  
Cathodic Protection ◽  
Sacrificial Anode ◽  
Photocatalytic Material

Effects of temperature on acceleration and simulation of indoor corrosion test of Q235 carbon steel

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Changxu Huang ◽  
Xuhong Su ◽  
Qingqing Song ◽  
Xudong Wang
Keyword(s):  
Carbon Steel ◽  
Corrosion Test ◽  
Salt Spray ◽  
Outdoor Exposure ◽  
Exposure Test ◽  
Content Type ◽  
Corrosion Tests ◽  
Q235 Carbon Steel ◽  
Effects Of Temperature

Purpose The purpose of this paper is to study the influence of temperature on the acceleration and simulation of indoor corrosion tests and the corrosion behavior of Q235 carbon steel. Design/methodology/approach The indoor corrosion test was carried out by continuous salt spray in a salt spray chamber. Weight loss analysis, X-ray diffraction, cannon 1500 D, scanning electron microscopy and electrochemical techniques are used to analyze the results. Findings It was found that thickness loss of Q235 carbon steel increases with higher temperature and it can reach 0.095 mm at 50°C. Compared with the Xisha exposure test, the acceleration rate can achieve 230 times. This phenomenon indicates that decreasing the experimental temperature is beneficial to the anti-corrosion of the Q235 carbon steel. It is fascinating to find that acceleration and simulation increase with temperature simultaneously, which shows that β-FeOOH promotes the corrosion rate and α-FeOOH provides high simulation. Meanwhile, electrochemical impedance spectroscopy indicates that the resistance of the rust layer improves with temperature. Practical implications Through the study, the authors found that with the increase of temperature, the acceleration and simulation of indoor corrosion test improved, corrosion products and kinetics are the same as those in outdoor exposure test, and which means that the laboratory can achieve the long-term corrosion degree of outdoor exposure in a short time, and the similarity with outdoor exposure is high. This helps to the study of marine atmospheric corrosion, and indoor accelerated corrosion tests can largely eliminate regional differences by adjusting some environmental factors, and lay a foundation for marine atmospheric corrosion. Originality/value The effects of temperature on the acceleration and simulation of indoor corrosion tests are discussed. Through laboratory experiments, the long-term service life of Q235 carbon in the Xisha marine atmosphere can be predicted effectively.

scholarly journals The Interaction of Biofoulants and Calcareous Deposits on Corrosion Performance of Q235 in Seawater

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 850
Author(s):  
Jie Zhang ◽  
Zhenhua Yu ◽  
Xia Zhao ◽  
Xiao Lan ◽  
Jiangwei Wang ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Cathodic Protection ◽  
Marine Microorganisms ◽  
Corrosion Performance ◽  
Calcareous Deposits ◽  
Q235 Carbon Steel ◽  
Ocean Conditions

An understanding of the interaction of calcareous deposits and biofoulants on the corrosion performance of steel during the fouling stage is both interesting and necessary. So, the effects of these factors on Q235 carbon steel were investigated and discussed for 20 weeks under real ocean conditions. The results indicate that calcareous deposits are favorable for the attachment of marine microorganisms. However, macroorganisms prefer adhering directly to the substrate. The generations of calcareous deposits have priority over the biofilm attachment under the condition of cathodic protection. Calcareous deposits can prevent steel against corrosion for four weeks without cathodic protection.

The study of the electrochemical properties of zinc-rich coating on the base of water sodium silicate

2019 ◽  
Vol 24 (4) ◽  
pp. 51-58
Author(s):  
Le Hong Quan ◽  
Nguyen Van Chi ◽  
Mai Van Minh ◽  
Nong Quoc Quang ◽  
Dong Van Kien
Keyword(s):  
Carbon Steel ◽  
Electrochemical Properties ◽  
Sodium Silicate ◽  
Cathodic Protection ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Electrical Contact ◽  
Electrochemical Impedance Spectra ◽  
Pure Zinc ◽  
Electric Circuits

The study examines the electrochemical properties of a coating based on water sodium silicate and pure zinc dust (ZSC, working title - TTL-VN) using the Electrochemical Impedance Spectra (EIS) with AutoLAB PGSTAT204N. The system consists of three electrodes: Ag/AgCl (SCE) reference electrode in 3 M solution of KCl, auxiliary electrode Pt (8x8 mm) and working electrodes (carbon steel with surface treatment up to Sa 2.5) for determination of corrosion potential (Ecorr) and calculation of equivalent electric circuits used for explanation of impedance measurement results. It was shown that electrochemical method is effective for study of corrosion characteristics of ZSC on steel. We proposed an interpretation of the deterioration over time of the ability of zinc particles in paint to provide cathodic protection for carbon steel. The results show that the value of Ecorr is between -0,9 and -1,1 V / SCE for ten days of diving. This means that there is an electrical contact between the zinc particles, which provides good cathodic protection for the steel substrate and most of the zinc particles were involved in the osmosis process. The good characteristics of the TTL-VN coating during immersion in a 3,5% NaCl solution can also be explained by the preservation of corrosive zinc products in the coating, which allows the creation of random barrier properties.

scholarly journals Design an Epoxy Coating with TiO2/GO/PANI Nanocomposites for Enhancing Corrosion Resistance of Q235 Carbon Steel

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2629
Author(s):  
Shimin Chen ◽  
Bo Li ◽  
Rengui Xiao ◽  
Huanhu Luo ◽  
Siwu Yu ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Photocurrent Density ◽  
Photoelectrochemical Performance ◽  
Q235 Steel ◽  
Protective Barrier ◽  
Barrier Coating ◽  
Pani Composite ◽  
Steel Protection ◽  
Q235 Carbon Steel

In this work, a ternary TiO2/Graphene oxide/Polyaniline (TiO2/GO/PANI) nanocomposite was synthesized by in situ oxidation and use as a filler on epoxy resin (TiO2/GO/PANI/EP), a bifunctional in situ protective coating has been developed and reinforced the Q235 carbon steel protection against corrosion. The structure and optical properties of the obtained composites are characterized by XRD, FTIR, and UV–vis. Compared to bare TiO2 and bare Q235, the TiO2/GO/PANI/EP coating exhibited prominent photoelectrochemical properties, such as the photocurrent density increased 0.06 A/cm2 and the corrosion potential shifted from −651 mV to −851 mV, respectively. The results show that the TiO2/GO/PANI nanocomposite has an extended light absorption range and the effective separation of electron-hole pairs improves the photoelectrochemical performance, and also provides cathodic protection to Q235 steel under dark conditions. The TiO2/GO/PANI/EP coating can isolate the Q235 steel from the external corrosive environment, and may generally be regarded a useful protective barrier coating to metallic materials. When the TiO2/GO/PANI composite is dispersed in the EP, the compactness of the coating is improved and the protective barrier effect is enhanced.

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