Mechanism of protective film formation during CO2 corrosion of X65 pipeline steel

2008 ◽  
Vol 15 (6) ◽  
pp. 702-706 ◽  
Author(s):  
Tong Li ◽  
Yongjin Yang ◽  
Kewei Gao ◽  
Minxu Lu
Keyword(s):  
Pipeline Steel ◽  
Film Formation ◽  
Co2 Corrosion ◽  
Protective Film

scholarly journals Spilanthes acmella Leaves Extract for Corrosion Inhibition in Acid Medium

Coatings ◽  
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.

scholarly journals Comparison Between the Action of Nano-Oxides and Conventional EP Additives in Boundary Lubrication

Lubricants ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 54
Author(s):  
Valdicleide Silva Mello ◽  
Marinalva Ferreira Trajano ◽  
Ana Emilia Diniz Silva Guedes ◽  
Salete Martins Alves
Keyword(s):  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Friction And Wear ◽  
Film Formation ◽  
Environmental Issues ◽  
Protective Film ◽  
Extreme Pressure ◽  
Extreme Pressure Additives ◽  
Environmental Requirements ◽  
Lubrication Conditions

Additives are essential in lubricant development, improving their performance by the formation of a protective film, thus reducing friction and wear. Some such additives are extreme pressure additives. However, due to environmental issues, their use has been questioned because their composition includes sulfur, chlorine, and phosphorus. Nanoparticles have been demonstrated to be a suitable substitute for those additives. This paper aims to make a comparison of the tribological performance of conventional EP additives and oxides nanoparticles (copper and zinc) under boundary lubrication conditions. The additives (nanoparticles, ZDDP, and sulfur) were added to mineral and synthetic oils. The lubricant tribological properties were analyzed in the tribometer HFRR (high frequency reciprocating rig), and during the test, the friction coefficient and percentual of film formation were measured. The wear was analyzed by scanning electron microscopy. The results showed that the conventional EP additives have a good performance owing to their anti-wear and small friction coefficient in both lubricant bases. The oxides nanoparticles, when used as additives, can reduce the friction more effectively than conventional additives, and displayed similar behavior to the extreme pressure additives. Thus, the oxide nanoparticles are more environmentally suitable, and they can replace EP additives adapting the lubricant to current environmental requirements.

Cooling Water Inhibitor Performance

CORROSION ◽  
1960 ◽  
Vol 16 (10) ◽  
pp. 473t-478t ◽  
Author(s):  
P. R. PUCKORIUS ◽  
W. J. RYZNER
Keyword(s):  
Corrosion Inhibitors ◽  
Film Formation ◽  
Cooling Water ◽  
Water Systems ◽  
Continuous Treatment ◽  
Protective Film ◽  
Low Level ◽  
Start Up ◽  
Actual Field ◽  
High Level

Abstract Corrosion inhibitors in open recirculating cooling water systems require rapid and complete film formation for maximum effectiveness. The protective film is established on clean surfaces by initial treatment with inhibitor at high dosage levels. Protection then can be maintained by continuous treatment at substantially lower levels. If operational difficulties should cause loss of the protective film, low level treatment after the film has been lost may result in severely increased corrosion and deposition. Laboratory corrosion, deposition and consumption studies with polyphosphate-based and chromate-based inhibitors illustrate the advantages of high level start-up and low level maintenance treatments. These data are confirmed by actual field experiences. 5.8.1

scholarly journals Protective Film Formation on AA2024-T3 Aluminum Alloy by Leaching of Lithium Carbonate from an Organic Coating

2015 ◽  
Vol 163 (3) ◽  
pp. C45-C53 ◽  
Author(s):  
Yanwen Liu ◽  
Peter Visser ◽  
Xiaorong Zhou ◽  
Stuart B. Lyon ◽  
Teruo Hashimoto ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Film Formation ◽  
Lithium Carbonate ◽  
Organic Coating ◽  
Protective Film

The mechanism for corrosion protective film formation on iron and nickel in acid solutions with organo-antimony compounds

1992 ◽  
Vol 33 (8) ◽  
pp. 1253-1265 ◽  
Author(s):  
Norimichi Saito ◽  
Hiroshi Nishihara ◽  
Kunitsugu Aramaki
Keyword(s):  
Film Formation ◽  
Protective Film ◽  
Acid Solutions

The Effect of Solution Ph and Ion Concentrations on Leaching of Silicate Glass

1982 ◽  
Vol 15 ◽  
Author(s):  
Bruce C. Bunker ◽  
George W. Arnold
Keyword(s):  
Film Formation ◽  
Protective Film ◽  
Selective Leaching ◽  
Exchange Reactions ◽  
Solution Ph ◽  
Reaction Type ◽  
Glass Dissolution ◽  
Gel Layer ◽  
Complex Process ◽  
Second Category

For complex glasses such as simulated nuclear wastes, glass dissolution is a complex process, involving selective leaching of cations, reprecipitation reactions, and protective film formation. In order to begin to understand this complex behavior, each of the above phenomena is being studied, one reaction at a time, on simple alkali silicate glasses under controlled environmental conditions. To date, two types of reactions have been investigated. The first reaction type is the selective leaching of cations from the glass, resulting in the formation of a hydrated “gel” layer on the glass surface. The second reaction type is the reaction of ionic or colloidal species in solution with this gel layer. Reactions in the second category include ion exchange reactions and sorption reactions which can result in protective film formation. Studies of these simple reactions have led to the development of new leaching models and to observations which begin to explain the behavior of complex glasses, and predict how glass dissolution should change as a function of the chemical environment.

Sign in / Sign up

Export Citation Format

Share Document