AMPP Store - Products tagged with 'pitting'

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Stress Corrosion Cracking of Austenitic Grade 347 and Duplex Grade 2205 Stainless Steels in Refinery Simulated Media Containing Hydrogen Sulfide and Chloride

Product Number: 51320-14406-SG

Author: K. Ravindranath, B. Al-Wakaa, R. Alazemi, N. Tanoli

Publication Date: 2020

$20.00

Stabilized austenitic stainless steel (SS) grade 347 is used extensively in high-temperature processes in the petroleum refining industry, while duplex SS (DSS) grade 2205 is a relatively newer material in the industry. Though these grades of SSs perform well in refinery process streams, there are incidents of failure of process equipment attributable to stress corrosion cracking (SCC). The paper deals with a study on the cracking susceptibility of SS grade 347 and DSS grade 2205 in refinery simulated process environments containing hydrogen sulfide and chloride. The paper also reports the electrochemical behavior of these SSs in the medium containing hydrogen sulfide and chloride. The electrochemical behavior of the alloys was assessed by cyclic polarization experiments. Slow strain rate test (SSRT) was used to evaluate the susceptibility of the alloys to SCC. The cyclic polarization studies indicate that the H2S – chloride synergism had a pronounced effect on the localized corrosion susceptibility of 347 SS, while the effect was marginal on the alloy DSS 2205. The SCC susceptibility of 347 SS and DSS 2205 is strongly influenced by hydrogen sulfide-chloride synergism. Initiation of corrosion pits and the sulfidation of active pits due to the synergism were the important steps in the initiation of SCC.

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Surface Treatment to Improve Corrosion Resistance of Pure Titanium

Product Number: 51317--9358-SG

ISBN: 9358 2017 CP

Author: Marco Ormellese

Publication Date: 2017

$20.00

The corrosion behaviors of pure titanium UNS R50250 and UNS R50400 were investigated and compared with electrochemical behavior of Ti-0.2Pd and Ti-0.3Mo-0.8Ni alloys (UNS R52400 and UNS R53400 respectively).

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The Pitting Behavior of Austenitic and Duplex Stainless Steels Under SO2 Environments with Cl- And F

Product Number: 51317--9241-SG

ISBN: 9241 2017 CP

Author: Zhu Wang

Publication Date: 2017

$20.00

Cyclic polarization measurements were used to illustrate the corrosion and passive behavior of the stainless steels under the tail gas conditions. Electrochemical behavior of stainless steels in SO2-saturated solutions with various concentrations of Cl- and F- was also studied.

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Understanding and Addressing the Challenges of Assessing the Corrosion Fatigue of Metallic Materials

Product Number: 51317--8918-SG

ISBN: 8918 2017 CP

Author: Christopher Engler

Publication Date: 2017

$20.00

How the selection of testing parameters affects the corrosion fatigue reststance of structural materials typically used in drilling equipment. Results obtained using the developed test methodology are compared with traditional testing such as high-chloride acidified solution

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Wet CO-CO2 Stress Corrosion Cracking in CCS Pipelines

Product Number: 51324-20669-SG

Author: Manoj Gonuguntla; Aruna V T; Johannes Sonke; Guruprasad Sundararajan

Publication Date: 2024

$40.00

Carbon capture and sequestration (CCS) is gaining greater importance in the industry transition to meet climate goals reducing carbon intensity. As the source of CO2 captured for sequestration widens to many more applications from oil and gas productions, power plants, refineries, chemical plants, steel manufacturing and other industries, the composition of the captured gas stream for sequestration sees various components. Some of the common impurities particularly from combustion processes are carbon monoxide, oxygen, SOx, NOx and others. Understanding the effect of presence of the various chemical species on material limits and maximum tolerance limits are crucial for safe operations of the assets. In one of the recent projects, there was a presence of CO in the CO2 stream, and it was imperative to identify the effect of this on the existing carbon steel pipeline. The pipeline was of X65 steel and fabricated for natural gas transmission. Wet CO-CO2 cracking is a reported degradation mode particularly as the CO concentration increases beyond 200 ppm in the gas phase or at partial pressures above 0.3 bar. This study is a combination of literature review of current state of art with respect to CO-CO2 cracking in carbon steel in presence of impurities and laboratory testing of welded X65 specimens exposed to CO concentration in dense (liquid) phase up to 1000 ppm and also in the presence of small concentrations of oxygen that also replicates some of the expected conditions in the project. The tests clearly indicate that the risk of CO-CO2 cracking is not significant up to the concentrations tested.

Products tagged with 'pitting'

Stress Corrosion Cracking of Austenitic Grade 347 and Duplex Grade 2205 Stainless Steels in Refinery Simulated Media Containing Hydrogen Sulfide and Chloride

Surface Treatment to Improve Corrosion Resistance of Pure Titanium

The Pitting Behavior of Austenitic and Duplex Stainless Steels Under SO2 Environments with Cl- And F

Understanding and Addressing the Challenges of Assessing the Corrosion Fatigue of Metallic Materials

Wet CO-CO2 Stress Corrosion Cracking in CCS Pipelines

Association for Materials Protection and Performance