scholarly journals Suppression of local corrosion of steel, brass and copper with IFKhAN-114 volatile inhibitor

2019 ◽  
Vol 8 (1) ◽  
Keyword(s):  
Local Corrosion ◽  
Volatile Inhibitor ◽  
Corrosion Of Steel

Investigation of a Steel Local Corrosion in Chloride-Containing Media

2021 ◽  
Vol 872 ◽  
pp. 7-13
Author(s):  
Varvara Rumyantseva ◽  
Viktoriya Konovalova
Keyword(s):  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Protective Coatings ◽  
Aggressive Medium ◽  
Electrochemical Corrosion ◽  
Steel Corrosion ◽  
Chloride Ions ◽  
Local Corrosion ◽  
Local Damage ◽  
Corrosion Of Steel

Aspects of the development of local corrosion on the metal surface under the influence of aggressive media containing chloride ions are presented. The main mechanisms leading to the formation and development of local damage of the surface of metals are described. The process of electrochemical corrosion of steel under the influence of chloride-containing medium is experimentally investigated. By constructing corrosion diagrams, the main indicators of steel corrosion in a 10% sodium chloride solution were determined, which allows one to judge the rate of development of corrosion processes with local damage to the protective coating and the degree of steel resistance depending on the aggressiveness of the medium. It is shown that protective coatings, such as modified phosphate and oxide-phosphate films, prevent the penetration of an aggressive medium to the surface of the protected metal and, accordingly, the anodic dissolution of the metal.

The influence of cyclic potential pulse on the local corrosion of X70 pipeline steel in the electrolytes with pH close to neutral

2021 ◽  
pp. 1-13
Author(s):  
Alevtina Rybkina ◽  
Natalia Gladkih ◽  
Andrey Marshakov
Keyword(s):  
Hydrogen Absorption ◽  
Pipeline Steel ◽  
Local Corrosion ◽  
Half Cycle ◽  
X70 Pipeline Steel ◽  
Quantitative Indicator ◽  
Bicarbonate Ions ◽  
Corrosion Of Steel

The effect of cyclic potential pulse (CIP) on the local corrosion of X70 pipeline steel in the solutions with various compositions was investigated. Local corrosion of steel increases with an increase in the duration of the cathode half-cycle of the CIP, in the presence of a promoter of hydrogen absorption and with an increase in the concentration of chloride and bicarbonate ions. A quantitative indicator is proposed, which determines the intensity of local corrosion under CIP

A new approach for describing pitting corrosion of steel bars in concrete

2017 ◽  
Vol 64 (6) ◽  
pp. 573-579
Author(s):  
Xinchun Guan ◽  
Lianjuan Miao ◽  
Hui Li ◽  
Jinping Ou
Keyword(s):  
Fractal Dimension ◽  
Pitting Corrosion ◽  
Depth Distribution ◽  
Local Corrosion ◽  
Content Type ◽  
Steel Bar ◽  
Steel Bars ◽  
Two Parameters ◽  
Corrosion Of Steel

Purpose The purpose of this study is to quantitively characterize pitting or local corrosion of steel bars. Characterization of pitting or local corrosion is important for steel bar corrosion research in concrete, which is still an unsolved problem for the reason that the pitting on corroded steel is distributed irregularly, besides the varied pitting depths. To solve this problem in a certain degree, two parameters were collectively used to find the pitting distribution and pitting depth distribution of corroded steel bar surface. Design/methodology/approach Corroded reinforcement bars were subjected to two different corrosive conditions to obtain the profile of the surface of corroded steel bar. The arithmetic mean deviation of the profile, Ra, also a roughness parameter, and the fractal dimension, D, were computed using MATLAB software from the data on corroded steel bar profiles scanned by a profile tester. Statistical analysis was performed to determine the parameters distribution of Ra. Findings Ra and D can assist gravimetric technique in defining the degree of pitting corrosion and make further understanding about the characterization of local or pitting corrosion. Originality/value Two parameters were collectively used to find the pitting distribution and pitting depth distribution of corroded steel bar surface, while many studies only study the fractal dimension of pitting corrosion. And, the relationship between these two parameters is studied when using them to describing the non-uniformity of pitting corrosion degree. Using these two parameters can much better describe the non-uniform degree of pitting corrosion.

scholarly journals The Mechanism of Corrosion of Steel 304L in the Presence of Copper in Industrial Installations / Mechanizm Korozji Stali Austenitycznej 304L W Obecności Miedzi W Instalacjach Przemysłowych

2015 ◽  
Vol 60 (4) ◽  
pp. 2657-2662
Author(s):  
M. M. Lachowicz ◽  
M. B. Lachowicz
Keyword(s):  
Austenitic Steel ◽  
Galvanic Corrosion ◽  
Active State ◽  
Local Corrosion ◽  
Macroscopic Scale ◽  
Corrosive Solution ◽  
Corrosion Of Steel

This paper presents the mechanism of corrosion of austenitic steel in the presence of copper. It has been found that when corrosion occurs, the presence of copper in the corrosive solution in the neighbourhood of austenitic steel results in the intensification of the corrosion processes. In the macroscopic scale, austenitic steel constitutes a cathode, but since copper precipitates can deposit on it, the steel can locally pass to the active state and become an anode in the places where copper deposited, which leads to its local corrosion due to galvanic corrosion.

Volatile inhibitor of carbon dioxide corrosion of steel

2000 ◽  
Vol 36 (3) ◽  
pp. 235-239 ◽  
Author(s):  
N. N. Andreev ◽  
K. A. Ibatullin ◽  
Yu. I. Kuznetsov ◽  
S. V. Oleinik
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Corrosion ◽  
Volatile Inhibitor ◽  
Corrosion Of Steel

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

Sign in / Sign up

Export Citation Format

Share Document