Synergistic Inhibition Effect of Chitosan and L-Cysteine for the Protection of Copper-Based Alloys against Atmospheric Chloride-Induced Indoor Corrosion

The protection of metals from atmospheric corrosion is a task of primary importance for many applications and many different products have been used, sometimes being toxic and harmful for health and the environment. In order to overcome drawbacks due to toxicity of the corrosion inhibitors and harmful organic solvents and to ensure long-lasting protection, new organic compounds have been proposed and their corrosion inhibition properties have been investigated. In this work, we describe the use of a new environment-friendly anticorrosive coating that takes advantage of the synergism between an eco-friendly bio-polymer matrix and an amino acid. The corrosion inhibition of a largely used Copper-based (Cu-based) alloy against the chloride-induced indoor atmospheric attack was studied using chitosan (CH) as a biopolymer and l-Cysteine (Cy) as an amino acid. To evaluate the protective efficacy of the coatings, tailored accelerated corrosion tests were carried out on bare and coated Cu-based alloys, further, the nature of the protective film formed on the Cu-based alloy surface was analyzed by Fourier-transformed infrared spectroscopy (FTIR) while the surface modifications due to the corrosion treatments were investigated by optical microscopy (OM). The evaluation tests reveal that the Chitosan/l-Cysteine (CH/Cy) coatings exhibit good anti-corrosion properties against chloride attack whose efficiency increases with a minimum amount of Cy of 0.25 mg/mL.

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Investigation of Mechanical and Anti-Corrosion Properties of Flame Sprayed Coatings

Advances in Materials Science ◽

10.1515/adms-2017-0049 ◽

2018 ◽

Vol 18 (4) ◽

pp. 42-53

Author(s):

M. Musztyfaga-Staszuk ◽

A. Czupryński ◽

M. Kciuk

Keyword(s):

Corrosion Resistance ◽

Industrial Applications ◽

Operating Conditions ◽

Coating Properties ◽

Corrosion Properties ◽

Accelerated Corrosion ◽

Corrosion Resistant ◽

Accelerated Corrosion Tests ◽

Sprayed Coatings ◽

Corrosion System

Abstract This article presents the results of an examination of the properties of thermal flame sprayed coatings produced by material in the form of four powders (two polymers: PA11 and PA12 CastoPlast, and two high purity: tin and aluminum) on the substrate of the unalloyed structural steel of S235JR grade. Investigations of coating properties are based on metallography tests (SEM and CLSM), measurement of microhardness (acc. to PN-EN ISO 6507-1:2007), anticorrosive (acc. to PN-EN ISO 9227:2017-06) and bend testing. Results demonstrate properties of flame sprayed coatings that are especially promising in the industrial applications where corrosion-resistant coating properties are required. Consequently, performed experiments show that the highest corrosion resistance is demonstrated by steel samples with a polyamide anti-corrosion system. Accelerated corrosion tests showed the lowest corrosion resistance of the tin coating system, however, they do not fully correspond to the corrosion processes in operating conditions.

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Magnesium, aluminum and zinc co-substituted hydroxyapatite: anti-corrosion properties

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-11-2018-2029 ◽

2019 ◽

Vol 66 (4) ◽

pp. 496-506

Author(s):

Lenka Šimková ◽

Petra Šulcová

Keyword(s):

Corrosion Inhibition ◽

Precipitation Method ◽

Corrosion Properties ◽

Accelerated Corrosion ◽

Content Type ◽

Corrosion Tests ◽

Synthesis Conditions ◽

Preliminary Corrosion ◽

Accelerated Corrosion Test ◽

Two Phases

Purpose The purpose of this study was to investigate the influence of doping ions Mg2+, Zn2+, Al3+ to the structure of hydroxyapatite (HAP; Ca10(PO4)6(OH)2) and subsequently to evaluate their adaptation in structure and their anticorrosive properties. Design/methodology/approach The substituted hydroxyapatite was synthesized by precipitation method that included the addition of Mg2+, Zn2+ and Al3+ containing precursors to partially replace Ca2+ ions in the hydroxyapatite structure. For precipitation synthesis, three ratios of Ca/P = 1; 1.67; 3 and two values of pH = 7 and 12 were selected. Samples 1 (Ca/P = 1; pH = 7), 2 (Ca/P = 1.67; pH = 7), 3 (Ca/P = 3; pH = 7) and 5 (Ca/P = 1.67; pH = 12) were chosen to monitor the influence of doping ions Mg2+, Zn2+ and Al3+ to the structure of hydroxyapatite and its anticorrosive properties. Findings The chosen synthesis conditions are appropriate for the formation of crystalline HAP substituted by elements Mg, Zn and Al. Only for one sample (1-Mg), two different phases (hydroxyapatite and whitlockite) were identified in the phase composition. On the basis of preliminary corrosion tests, pigments were divided into three groups pursuant to their anticorrosion effectivity: pigments with high corrosion-inhibition efficiency; pigments without anticorrosive properties; and pigments that promote corrosion processes. Originality/value In addition, no doping effect can be observed except for the sample 1-Mg, which consists of two phases (hydroxyapatite and whitlockite). Preliminary corrosion tests prove that some samples of HAP have extremely high anticorrosive effectivity as effectivity of the commercial pigments. The accelerated corrosion test showed that HAP samples have insufficient corrosion-inhibition properties for coating applications compared with the commercial pigment.

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Corrosion tests in artificial atmospheres. Accelerated corrosion tests involving alternate exposure to corrosion-promoting gases, neutral salt-spray and drying

10.3403/30310698 ◽

2015 ◽

Keyword(s):

Salt Spray ◽

Neutral Salt ◽

Accelerated Corrosion ◽

Corrosion Tests ◽

Accelerated Corrosion Tests

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Effect of mechanical restraint on the rate of corrosion in concrete

Canadian Journal of Civil Engineering ◽

10.1139/l97-042 ◽

1998 ◽

Vol 25 (1) ◽

pp. 81-86 ◽

Cited By ~ 9

Author(s):

N Hearn ◽

J Aiello

Keyword(s):

Mix Design ◽

Concrete Repair ◽

Accelerated Corrosion ◽

One Dimensional ◽

Mechanical Restraint ◽

Corrosion Rates ◽

Accelerated Corrosion Tests ◽

The Matrix ◽

The Relationship

Experimental work on prismatic concrete specimens was conducted to determine the relationship between mechanical restraint and the rate of corrosion. The current together with the changes in strain of the confining frame were monitored during the accelerated corrosion tests. The effect of mix design and cracking on the corrosion rates was also investigated. The results show that one-dimensional mechanical restraint retards the corrosion process, as indicated by the reduction in the steel loss. Improved quality of the matrix, with and without cracking, reduces the rate of steel loss. In the inferior quality concrete, the effect of cracking on the corrosion rate is minimal.Key words: corrosion, concrete, repair.

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Accelerated Corrosion Tests of Al-B4C Neutron Absorber Used in Spent Nuclear Fuel Pool

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2021.153011 ◽

2021 ◽

pp. 153011

Author(s):

Yunsong Jung ◽

Yunju Lee ◽

Ji Hyun Kim ◽

Sangjoon Ahn

Keyword(s):

Nuclear Fuel ◽

Spent Nuclear Fuel ◽

Accelerated Corrosion ◽

Neutron Absorber ◽

Corrosion Tests ◽

Accelerated Corrosion Tests ◽

Spent Nuclear Fuel Pool

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Spilanthes acmella Leaves Extract for Corrosion Inhibition in Acid Medium

Coatings ◽

10.3390/coatings11010106 ◽

2021 ◽

Vol 11 (1) ◽

pp. 106

Author(s):

Akbar Ali Samsath Begum ◽

Raja Mohamed Abdul Vahith ◽

Vijay Kotra ◽

Mohammed Rafi Shaik ◽

Abdelatty Abdelgawad ◽

...

Keyword(s):

Mild Steel ◽

Corrosion Inhibition ◽

Active Sites ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Film Formation ◽

Protective Film ◽

Surface Protection ◽

Tafel Polarization ◽

Spilanthes Acmella

In the present study, the corrosion inhibition effect of Spilanthes acmella aqueous leaves extract (SA-LE) on mild steel was investigated in 1.0 M HCl solution at different temperature using weight loss, Tafel polarization, linear polarization resistance (LPR), and electrochemical impedance (EIS) measurements. Adsorption of inhibitor on the surface of the mild steel obeyed both Langmuir and Temkin adsorption isotherms. The thermodynamic and kinetic parameters were also calculated to determine the mechanism of corrosion inhibition. The inhibition efficiency was found to increase with an increase in the inhibitor concentration i.e., Spilanthes acmella aqueous leaves extract, however, the inhibition efficiency decreased with an increase in the temperature. The phytochemical constituents with functional groups including electronegative hetero atoms such as N, O, and S in the extract adsorbed on the metal surface are found responsible for the effective performance of the inhibitor, which was confirmed by Fourier-transform infrared spectroscopy (FT-IR) and ultraviolet–visible spectroscopic (UV-Vis) studies. Protective film formation against corrosion was confirmed by scanning electron microscopy (SEM), atomic force microscopy (AFM), and contact angle studies. The result shows that the leaves extract acts as corrosion inhibitor and is able to promote surface protection by blocking active sites on the metal.

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Mannich Base as Corrosion Inhibitors for N80 Steel in a CO2 Saturated Solution Containing 3 wt % NaCl

Materials ◽

10.3390/ma12030449 ◽

2019 ◽

Vol 12 (3) ◽

pp. 449 ◽

Cited By ~ 7

Author(s):

Mingjin Tang ◽

Jianbo Li ◽

Zhida Li ◽

Luoping Fu ◽

Bo Zeng ◽

...

Keyword(s):

Corrosion Inhibitor ◽

Corrosion Inhibition ◽

Steel Sheet ◽

Mannich Base ◽

Saturated Solution ◽

Control Group ◽

Protective Film ◽

Blank Control Group ◽

Inhibition Effect ◽

N80 Steel

In this paper, a corrosion inhibitor containing nitrogen atoms and a conjugated π bond was synthesised, and its final product synthesised by the optimal conditions of the orthogonal test results is named multi-mannich base (MBT). The corrosion inhibition effect on the N80 steel sheet of the corrosion inhibitor was evaluated in a CO2 saturated solution containing 3 wt % NaCl; the corrosion rate was 0.0446 mm/a and the corrosion inhibition rate was 90.4%. Through electrochemical and adsorption theory study, MBT is a mixed corrosion inhibitor that mainly shows cathode suppression capacity. The adsorption of MBT on the surface of the steel sheet follows the Langmuir adsorption isotherm; it can be spontaneously adsorbed on the surface of the N80 steel sheet, which has a good corrosion inhibition effect. The surface of the N80 steel sheet was microscopically characterised by atomic force microscope (AFM). It can be seen from the results that the N80 steel sheet with MBT added is significantly different from the blank control group; the surface of the steel sheet is relatively smooth, indicating that MBT forms an effective protective film on the surface of N80 steel, which inhibits the steel sheet.

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