a neural network with feed forward topology and back propagation algorithm was used to investigate the effect of composition on mechanical properties in api x65 microalloyed steel (used in manufacturing of large diameter pipes). experimental data was obtained by cutting 100 specimens from pipes manufactured in industrial scale (with similar heats and manufacturing processes). the chemical analy...

The propagation of localized corrosion on API 5L X65 carbon steel in hydrogenocarbonated solution containing chloride ions was monitored during long immersion times by electrochemical noise (EN) measurements ZRA mode. Monitoring from the EN amplitude is possible but interpreting potential and current transients after made difficult different processes (metastable or stable pits, crevices, produ...

in this work, electrochemical methods such as tafel polarization and electrochemical impedance spectroscopy (eis) were used to study the inhibition efficiency of nettle leaves hydroalcoholic extract as a green corrosion inhibitor of api 5l carbon steel in 0.5 m h2so4 solution. the results showed that the inhibition efficiency was increased with increasing the concentration of the extract and th...

A novel method to classify the aggressiveness of soil considering its physicochemical content and development new synthetic solutions for lab uses is proposed. The results showed that main criteria existing in literature corrosivity classification might cause misunderstandings about real aggressiveness. proposed aim cover a wide range found worldwide order refine assessment their characteristic...

This research studies the effect of normalization on ductility and corrosion resistance API 5L X65 pipe. Normalization conducted at a temperature 900 °C with holding time 30, 60, 90, 120, 150 minutes, followed by cooling down to room using an external air. Corrosion testing normalized specimens was performed seawater as corrosive environment, -and were also tested for microhardness determine th...

Low-carbon steel is widely used in industrial pipelines, and corrosion studies are focused mostly on erosion-corrosion, its prediction control. In this paper, the rate pipelines modeled using a flow loop measured by linear polarization resistance method (LPR) 3-electrode setup for API-5L-X65 QT steel. Optical microscopy SEM conducted to examine surface of sample products. The effect NaCl concen...

In this work, the results obtained from studying the anodic dissolution of pure iron and API X-65 5L pipeline steel after 40 min and 12 h exposure period in 4.0 wt % NaCl solutions at room temperature were reported. Potential-time, electrochemical impedance spectroscopy, potentiodynamic polarization, and chronoamperometric current-time at constant potential techniques were employed. It has been...