ChemInform Abstract: Electrochemical Incorporation of Molybdenum in the Passive Layer of A 17% Cr Ferritic Stainless Steel. Its Influence on Film Stability in Sulphuric Acid and on Pitting Corrosion in Chloride Media.

ChemInform ◽  
2010 ◽  
Vol 26 (14) ◽  
pp. no-no
Author(s):  
S. MAXIMOVITCH ◽  
G. BARRAL ◽  
F. LE CRAS ◽  
F. CLAUDET
Keyword(s):  
Stainless Steel ◽  
Sulphuric Acid ◽  
Ferritic Stainless Steel ◽  
Pitting Corrosion ◽  
Passive Layer ◽  
Film Stability

Inspection and mitigation for pitting corrosion on stainless steel process piping to prevent process safety event and loss production opportunity in Medco E&P

2021 ◽  
Author(s):  
I. Rosyadi
Keyword(s):  
Stainless Steel ◽  
Pitting Corrosion ◽  
Sun Exposure ◽  
Passive Layer ◽  
Process Safety ◽  
Pipe Surface ◽  
Corrosion Propagation ◽  
Process Piping ◽  
Safety Event ◽  
Steel Piping

Stainless steel piping has excellent corrosion resistant properties, both internal or external piping surface. In humid circumstances, sea vapor containing chlorine will be trapped on the pipe surface, especially pipes below deck with minimum sun exposure (more humid). Chlorine on the external pipe surface will damage the passive layer of stainless steel pipe. Damage speed is faster than recovery of passive layer stainless steel. This condition lead to a lot of localized pitting corrosion spread. The corrosion was detected visually and carried out with dye penetrant inspection to assure pitting condition. Actual dimension of pitting (depth, diameter) cannot be measured due to limitation of the NDE technique. This pitting corrosion can result hydrocarbon leakage as a process safety event that contributes loss of production opportunity. Without modification circumstances, this condition can be stopped immediately by application of a viscos elastic coating to prevent pitting corrosion propagation. Application of viscos elastic coating is simpler and faster when compared to conventional coating. Viscos elastic coating will protect stainless steel piping surface against oxygen and chloride in humid circumstances so that stainless steel can recover passive layer and stop pitting corrosion.

Pitting Corrosion of Sensitized Ferritic Stainless Steel

CORROSION ◽  
1972 ◽  
Vol 28 (7) ◽  
pp. 255-258 ◽  
Author(s):  
C. R. RAREY ◽  
A. H. ARONSON
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Pitting Corrosion

scholarly journals On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 794 ◽  
Author(s):  
Yiqi Zhou ◽  
Dirk Lars Engelberg
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Pitting Corrosion ◽  
Corrosion Behaviour ◽  
General Corrosion ◽  
Full Spectrum ◽  
Nucleation Sites ◽  
Corrosion Pitting ◽  
Cathodic Region ◽  
Bipolar Electrochemistry

Bipolar electrochemistry has been applied to Type 420 ferritic stainless steel in order to determine the full spectrum of anodic-to-cathodic polarisation behaviour. The occurrence of crevice corrosion, pitting corrosion in combination with general corrosion, pitting corrosion only, general corrosion only, followed by a cathodic region has been observed. Instances of pitting corrosion initiated near chromium-rich carbides with Cr23C6, Cr3C2, and Cr7C3 identified as pit nucleation sites. The observed pit growth kinetics were independent of the electrochemical over-potential. Characterisation of the pit size distributions supports the presence of a critical dissolved volume for the transition of metastable to stable pit growth and pit coalescence.

Surface and corrosion properties of Type 430 ferritic stainless steel in parsley (Petroselinum Sativum) essential oil-containing sulphuric acid solution

2021 ◽  
Author(s):  
Omotayo Sanni ◽  
Jianwei Ren ◽  
Tien-Chien Jen
Keyword(s):  
Stainless Steel ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Essential Oils ◽  
Sulphuric Acid ◽  
Ferritic Stainless Steel ◽  
Stainless Steel Surface ◽  
Corrosion Properties ◽  
Surface Protection ◽  
Scanning Electron

Abstract This study examined the corrosion inhibiting properties of parsley (petroselinum sativum) essential oils, for Type 430 ferritic stainless steel in 0.5 molar sulphuric acid solutions. In this study, weight loss, electrochemical and scanning electron microscope techniques were used in gaining a detailed understanding of inhibition effects of parsley (petroselinum sativum) essential oils (PEO) on Type 430 ferritic stainless steel corrosion. The inhibitor studied exhibits good anti-corrosion performance with 98.65 % inhibition efficiency. This result could be ascribed to the adsorbed PEO on the surface of the stainless steel, and this was verified by surface visualization using optical and scanning electron microscope techniques while the crystallographic variation of the inhibited sample is studied by X-ray diffraction (XRD). The adsorption of PEO onto stainless steel surface is controlled by Langmuir adsorption isotherms. Optical images of non-inhibited specimens showed a severely corroded surface with a visible macro pit on the stainless steel from sulphuric solutions. The inhibited sample shows improved surface owing to the surface protection effect of PEO molecules. The corrosion inhibition performance of PEO is due to the presence of active constituents which enhanced the film formation over the surface of the metal, thus, mitigating corrosion.

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