scholarly journals Comparative Study on Flow-Accelerated Corrosion and Erosion–Corrosion at a 90° Carbon Steel Bend

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1780 ◽  
Author(s):  
Li Zeng ◽  
Geng Chen ◽  
Hanxin Chen
Keyword(s):  
Carbon Steel ◽  
Comparative Study ◽  
Surface Analysis ◽  
Electrochemical Measurements ◽  
Accelerated Corrosion ◽  
Corrosion Rates ◽  
Erosion Corrosion ◽  
Flow Accelerated Corrosion ◽  
Inside Wall

Electrochemical measurements and surface analysis are performed to comparatively study flow-accelerated corrosion (FAC) and erosion–corrosion (E-C) behavior at a 90° carbon steel bend. The corrosion rates are higher under FAC conditions than those under E-C conditions. For FAC, the corrosion is more serious at the inside wall. However, corrosion is exacerbated at the outside wall under E-C conditions. No erosion scratches are observed under FAC conditions and at the inside wall under E-C conditions, while remarkable erosion scratches appear at the outside wall under E-C conditions. The dominant hydrodynamics affecting FAC and E-C are remarkably different.

scholarly journals Flow accelerated corrosion and erosion−corrosion behavior of marine carbon steel in natural seawater

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Yunze Xu ◽  
Qiliang Zhang ◽  
Qipiao Zhou ◽  
Shan Gao ◽  
Bin Wang ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Impact Energy ◽  
Electrochemical Corrosion ◽  
Natural Seawater ◽  
Accelerated Corrosion ◽  
Impingement Jet ◽  
Erosion Corrosion ◽  
Mechanical Erosion ◽  
Flow Accelerated Corrosion ◽  
The Impact

AbstractIn this work, flow accelerated corrosion (FAC) and erosion−corrosion of marine carbon steel in natural seawater were electrochemically studied using a submerged impingement jet system. Results show that the formation of a relatively compact rust layer in flowing natural seawater would lead to the FAC pattern change from ‘flow marks’ to pits. The increase of the flow velocity was found to have a negligible influence on the FAC rate at velocities of 5−8 m s−1. The synergy of mechanical erosion and electrochemical corrosion is the main contributor to the total steel loss under erosion−corrosion. The increase of the sand impact energy could induce the pitting damage and accelerate the steel degradation. The accumulation of the rust inside the pits could facilitate the longitudinal growth of the pits, however, the accumulated rusts retard the erosion of the pit bottom. The erosion and corrosion could work together to cause the steel peeling at the pit boundary. The steel degradation would gradually change from corrosion-dominated to erosion-dominated along with the impact energy increasing.

Wall-Thinning Analysis of the Pipelines in the Secondary Section of NPP

2013 ◽  
Author(s):  
Na Ma ◽  
Li Wang ◽  
Jinguang Qin
Keyword(s):  
Carbon Steel ◽  
Nuclear Power ◽  
Power Plants ◽  
Xrd Analysis ◽  
Operating Conditions ◽  
Chemical Compositions ◽  
Accelerated Corrosion ◽  
Wall Thinning ◽  
Erosion Corrosion ◽  
Flow Accelerated Corrosion

Wall-thinning investigation of three carbon steel pipe samples from secondary section of nuclear power plants has been carried out in this paper. The operating conditions of the three pipe samples are quite different, which leads to the different wall-thinning reasons and characteristics of the pipes. The chemical compositions of the steel materials, the stereomicroscope examinations, SEM examinations, as well as the XRD analysis are performed. The results show that: The wall-thinning of No.1 elbow was caused by erosion corrosion; the wall-thinning of No.2 elbow was caused by flow accelerated corrosion; the wall-thinning and crevasse of No.3 orifice plate was caused by cavitations. Measures to solve the wall-thinning problems of different pipes are also given in this paper.

Analytical Investigation of Deaerator Steam Inlet Nozzle Corrosion Allowance in a CANDU Station

2009 ◽  
Author(s):  
Ali Keshavarz ◽  
Andrew K. Ali ◽  
Randy K. Lall
Keyword(s):  
Finite Element ◽  
Carbon Steel ◽  
Stress Analysis ◽  
Analytical Investigation ◽  
Percentage Error ◽  
Metal Loss ◽  
Fe Model ◽  
Accelerated Corrosion ◽  
Materials Properties ◽  
Flow Accelerated Corrosion

Flow-accelerated corrosion (FAC) is a phenomenon that results in metal loss from piping, vessels and equipment made of carbon steel. This metal loss can lead to stress to occur at the steam inlet nozzle side, where it is located at the side of the deaerator. This paper presents a method to find the thickness critical of the steam inlet nozzle. A Finite Element (FE) model of the pressure vessel head was created to perform a stress analysis using NX Nastran 5.0. By applying materials properties, loads and constraints to the model, the results obtained are required to satisfy the following criterion: vonMises≥SySy=YieldStrength The results obtained from the stress analysis were analyzed to obtain a corrosion allowance and it was compared to the recommended value from a normal deaerator design, which is roughly 0.25 inches. From the FE model, and by continuously reducing the thickness of the nozzle, it was determined that the corrosion allowance is 0.229 inches, and that the percentage error was 8.4%.

Numerical Simulation of Turbulent Flow in Carbon Steel Pipes Leading to Flow Accelerated Corrosion

2014 ◽  
Vol 39 (8) ◽  
pp. 6435-6451 ◽  
Author(s):  
Rani Hari Ponnamma ◽  
Divya Teegala ◽  
Sahaya Ravi Ranjan ◽  
Vivekananda Kain ◽  
Barua Dipak Kumar
Keyword(s):  
Numerical Simulation ◽  
Carbon Steel ◽  
Turbulent Flow ◽  
Accelerated Corrosion ◽  
Steel Pipes ◽  
Flow Accelerated Corrosion

Flow accelerated corrosion of carbon steel feeder pipes from pressurized heavy water reactors

2012 ◽  
Vol 429 (1-3) ◽  
pp. 226-232 ◽  
Author(s):  
J.L. Singh ◽  
Umesh Kumar ◽  
N. Kumawat ◽  
Sunil Kumar ◽  
Vivekanand Kain ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Heavy Water ◽  
Accelerated Corrosion ◽  
Water Reactors ◽  
Flow Accelerated Corrosion
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