scholarly journals Effect of AC interference on the corrosion behavior of cathodically protected mild steel in an artificial soil solution. Part I: Investigation on formed corrosion product layer

2021 ◽  
Author(s):  
Mario Markić ◽  
Serkan Arat ◽  
Wolfram Fürbeth
Keyword(s):  
Mild Steel ◽  
Soil Solution ◽  
Corrosion Product ◽  
Corrosion Behavior ◽  
Product Layer ◽  
Artificial Soil ◽  
Corrosion Product Layer ◽  
Ac Interference

scholarly journals Corrosion behavior of HRB400 and HRB400M steel bars in concrete under DC interference

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Qingmiao Ding ◽  
Yuning Gao ◽  
Ruiyang Liu ◽  
Yaozhi Li ◽  
Lei Jin ◽  
...  
Keyword(s):  
Corrosion Product ◽  
Corrosion Behavior ◽  
Direct Current ◽  
Product Layer ◽  
Corrosion Products ◽  
Product Analysis ◽  
Experimental Conditions ◽  
Corrosion Product Layer ◽  
Steel Bars ◽  
Concrete Solution

AbstractThe influence of direct current interference on the corrosion behavior of HRB400 and HRB400M steel bars in simulated concrete solution was studied using methods such as weight loss experiment, electrochemical experiment, surface technology and product analysis. The research results showed that with the increase of DC interference voltage, the corrosion rates of HRB400 and HRB400M steel bars would increase. The corrosion resistance of HRB400M steel bars was better than HRB400 steel bars under the experimental conditions. In addition, direct current interference could cause damage to the corrosion product layer on the surface of HRB400 steel bars and HRB400M steel bars. And the corrosion form and corrosion product types of HRB400 and HRB400M steel bars would be affected by direct current interference. The main corrosion products of HRB400 steel bars included γ-FeOOH and Fe2O3 when it was not interfered by DC. When DC interference was applied, the main corrosion products included Fe3O4 and Fe2O3. The corrosion products on the surface of HRB400M steel bars were mainly Fe3O4 and Fe2O3, and the types of products increased to form Cr2O3 and MnFe2O4.

Simulation of The State of Carbon Steel n Years After Disposal with n Years of Corrosion Product on its Surface in a Bentonite Environment

1994 ◽  
Vol 353 ◽  
Author(s):  
Yoichi Kojima ◽  
Toshinobu Hioki ◽  
Shigeo Tsujikawa
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Corrosion Product ◽  
Corrosion Behavior ◽  
Steel Corrosion ◽  
Product Layer ◽  
The State ◽  
Corrosion Product Layer ◽  
Time Frames

AbstractThe use of bentonite as buffer and carbon steel as overpack material for the geological disposal of nuclear waste is under investigation. To better assess the long term integrity of the carbon steel overpack, a quantitative analysis of the corrosion behavior on the steel surface for time frames beyond that of feasible empirical determination is required. The state n years after disposal, consisting of Carbon Steel / Corrosion Products + Bentonite / Water, was simulated and the corrosion behavior of the carbon steel in this state investigated. The following facts became apparent. Both the corrosion rate and the non-uniformity of it increased with increase in the corrosion product content in the compacted bentonite. When the corrosion product layer was formed between the carbon steel and the bentonite, it ennobled the corrosion potential and increased the corrosion rate.

Practical Experiences with Linear Polarization Measurements

CORROSION ◽  
1977 ◽  
Vol 33 (4) ◽  
pp. 117-128 ◽  
Author(s):  
R. H. HAUSLER
Keyword(s):  
Corrosion Product ◽  
Linear Polarization ◽  
Tap Water ◽  
Product Layer ◽  
Phase System ◽  
Two Phase ◽  
Ohmic Resistance ◽  
Corrosion Product Layer ◽  
Practical Experiences ◽  
Water Saturated

Abstract The linear polarization technique in principle is a convenient and rapid way for determining corrosion rates. In practice, one finds that it is often applied under conditions alien to the assumptions on the basis of which it was derived. This paper will present a series of comparative observations between linear polarization, resistance probe, and weight loss measurements in different systems. The systems studied were: (1) Hydrochloric acid containing acetylenic inhibitors, (2) a two phase system containing hydrocarbon and water saturated with H2S, and (3) tap water containing various inhibitors. An equation will be derived showing the effect of ohmic resistance due to corrosion product buildup. The effect of polarization on the properties of a corrosion product layer will be discussed qualitatively.

21. Influence of hydrazine and higher pH on the corrosion product layer of austenitic steel

1989 ◽  
pp. 1: 99-104
Author(s):  
J. Kysela ◽  
K. Jindrich ◽  
G. George ◽  
H. Kelm ◽  
D. Nebel ◽  
...  
Keyword(s):  
Austenitic Steel ◽  
Corrosion Product ◽  
Product Layer ◽  
Corrosion Product Layer

Influence of Pyrrhotite on the Corrosion of Mild Steel

CORROSION ◽  
10.5006/2505 ◽  
2017 ◽  
Vol 74 (1) ◽  
pp. 37-49 ◽  
Author(s):  
Saba Navabzadeh Esmaeely ◽  
Gheorghe Bota ◽  
Bruce Brown ◽  
Srdjan Nešić
Keyword(s):  
Mild Steel ◽  
Steel Surface ◽  
Product Layer ◽  
Localized Corrosion ◽  
X Ray Diffraction ◽  
Galvanic Coupling ◽  
X Ray ◽  
H2s Corrosion ◽  
Corrosion Product Layer ◽  
Nacl Concentration

As a result of the electrical conductivity of pyrrhotite, it was hypothesized that its presence in the corrosion product layer on a steel surface could lead to localized corrosion. Mild steel specimens (API 5L X65) were pretreated to form a pyrrhotite layer on the surface using high-temperature sulfidation in oil. The pretreated specimens were then exposed to a range of aqueous CO2 and H2S corrosion environments at 30°C and 60°C. X-ray diffraction data showed that the pyrrhotite layer changed during exposure; in an aqueous CO2 solution it underwent dissolution, while in a mixed CO2/H2S solution it partially transformed to troilite, with some mackinawite formation. Initiation of localized corrosion was observed in both cases. It was concluded that this was the result of a galvanic coupling between the pyrrhotite layer and the steel surface. The intensity of the observed localized corrosion varied with solution conductivity (NaCl concentration); a more conductive solution resulted in higher localized corrosion rates, consistent with the galvanic nature of the attack.

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