Effect of Oxidizing Decontamination Process on Corrosion Property of 304L Stainless Steel

Corrosion behaviors of 304L stainless steel (SS) and 304L SS with oxides film (preoxidation 304L SS) in 1 g/L potassium permanganate solution of various pH values were investigated by using mass loss, electrochemical measurement and scanning electron microscope (SEM) observation. The results showed that mass loss of 304L SS increases with the increase of sodium hydroxide or nitric acid concentration in 1 g/L potassium permanganate solution. The polarization curves of 304L SS in potassium permanganate solution show that passive zones are destroyed more easily in acid potassium permanganate solution than alkaline potassium permanganate solution. The corrosion ability of acid potassium permanganate (NP) decontamination solution used for 304L SS is more aggressive than alkaline potassium permanganate (AP) solution. The oxide film on the surface of preoxidation 304L SS can be removed completely in two oxidation reduction decontamination cycles, oxidizing solution of which comprised 0.4g/L sodium hydroxide and 1g/L potassium permanganate. The 304L SS and preoxidation 304L SS performed alkaline oxidation reduction decontamination of 3 cycles were reoxidation. The micromorphology of reoxidation specimens was similar to preoxidation 304L SS. Therefore the chemical decontamination of alkaline oxidizing and acid reducing steps had no negative effect on corrosion of 304L SS and reoxidation of 304L SS carried out decontamination.

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Evaluation of Stress Corrosion Cracking of Type 304L Stainless Steel in Low Concentration Sodium Hydroxide Solution with High Temperature

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.353-358.3031 ◽

2007 ◽

Vol 353-358 ◽

pp. 3031-3034

Author(s):

Rong Rong Zhou ◽

Jian Ming Gong ◽

Feng Li ◽

Shan Tung Tu

Keyword(s):

Stainless Steel ◽

High Temperature ◽

Stress Corrosion ◽

Sodium Hydroxide ◽

Stress Corrosion Cracking ◽

Sodium Hydroxide Solution ◽

Corrosion Cracking ◽

304L Stainless Steel ◽

Low Concentration ◽

Hydroxide Solution

Stress corrosion cracking (SCC) of austenitic stainless steel serviced in aggressive environment often occurs in power, petrochemical industry, and leads to premature equipment failure and great economic loss. This paper focuses on the problem of the SCC on the 304L stainless steel nozzle of a hydrogenation reactor, which is caused due to on-line alkali cleaning. Susceptibility for SCC was evaluated by Slow Strain Rate Test (SSRT) for as-rolled and sensitized 304L stainless steel in low concentration sodium hydroxide solution with high temperature. The effects of different strain rates, different concentration of sodium hydroxide and different solution temperatures on SCC were investigated. On the basis of this, the contrast tests were also performed in high temperature pure water. After SSRT, fractograph of the fractured specimens was analyzed by using scanning electron microscopy (SEM).

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Evaluation of Stress Corrosion Cracking of Type 304L Stainless Steel in Low Concentration Sodium Hydroxide Solution with High Temperature

Key Engineering Materials - Progresses in Fracture and Strength of Materials and Structures ◽

10.4028/0-87849-456-1.3031 ◽

2007 ◽

pp. 3031-3034

Author(s):

Rong Rong Zhou ◽

Jian Ming Gong ◽

Feng Li ◽

Shan Tung Tu

Keyword(s):

Stainless Steel ◽

High Temperature ◽

Stress Corrosion ◽

Sodium Hydroxide ◽

Stress Corrosion Cracking ◽

Sodium Hydroxide Solution ◽

Corrosion Cracking ◽

304L Stainless Steel ◽

Low Concentration ◽

Hydroxide Solution

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The effects of sodium hydroxide and potassium permanganate treatment on roughness of coconut fiber surface

MATEC Web of Conferences ◽

10.1051/matecconf/201820405004 ◽

2018 ◽

Vol 204 ◽

pp. 05004 ◽

Cited By ~ 4

Author(s):

Muhammad Arsyad ◽

Rudy Soenoko

Keyword(s):

Surface Roughness ◽

Data Processing ◽

Sodium Hydroxide ◽

Potassium Permanganate ◽

Sodium Hydroxide Solution ◽

Fiber Surface ◽

Coconut Fiber ◽

Potassium Permanganate Solution ◽

Hydroxide Solution ◽

Treatment Research

The purpose of this study was to determine the grade of roughness of coconut fiber surface as result of sodium hydroxide and potassium permanganate treatment. Research stages are soaking for 3 hours, testing, and data processing. Coconut fiber is soaked in 5%, 10%, 15%, 20% sodium hydroxide solution. Then soaked in 0.25%, 0.5%, 0.75% and 1% potassium permanganate solution. After that, the coconut fiber is dried in the oven at 90 °C for 5 hours. Thereafter, measurement of surface roughness. The measurement of surface roughness was did in two methods namely SEM, and surface roughness gauge. Based on the results of the tests, it was concluded that the higher concentrations of sodium hydroxide and potassium permanganate solutions gave higher grades of surface roughness compared with untreated fibers.

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Etching of LLDPE and LLDPE/HDPE blends

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100163460 ◽

1996 ◽

Vol 54 ◽

pp. 200-201

Author(s):

M. S. Bischel ◽

J. M. Schultz

Keyword(s):

Potassium Permanganate ◽

Morphological Features ◽

Narrow Fraction ◽

Potassium Permanganate Solution ◽

Commercial Applications ◽

Microscopy Techniques

Despite its rapidly growing use in commercial applications, the morphology of LLDPE and its blends has not been thoroughly studied by microscopy techniques. As part of a study to examine the morphology of a LLDPE narrow fraction and its blends with HDPE via SEM, TEM and AFM, an appropriate etchant is required. However, no satisfactory recipes could be found in the literature. Mirabella used n-heptane, a solvent for LLDPE, as an etchant to reveal certain morphological features in the SEM, including faint banding in spherulites. A 1992 paper by Bassett included a TEM micrograph of an axialite of LLDPE, etched in a potassium permanganate solution, but no details were given.Attempts to use n-heptane, at 60°C, as an etchant were unsuccessful: depending upon thickness, samples swelled and increased in diameter by 5-10% or more within 15 minutes. Attempts to use the standard 3.5% potassium permanganate solution for HDPE were also unsuccessful: the LLDPE was severely overetched. Weaker solutions were also too severe.

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RELAXATION PEAKS OF COLD WORKED 304L STAINLESS STEEL

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1981530 ◽

1981 ◽

Vol 42 (C5) ◽

pp. C5-193-C5-198 ◽

Cited By ~ 4

Author(s):

N. Igata ◽

H. B. Chen ◽

K. Miyahara ◽

T. Uba

Keyword(s):

Stainless Steel ◽

304L Stainless Steel ◽

Cold Worked

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CARPENTER PROJECT 70+ TYPE 304/304L

Alloy Digest ◽

10.31399/asm.ad.ss0875 ◽

2003 ◽

Vol 52 (2) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Physical Properties ◽

Heat Treating ◽

General Purpose ◽

304L Stainless Steel ◽

Type 304 ◽

Complex Parts

Abstract Carpenter Project 70+ Type 304/304L is a modified version of Type 304/304L stainless steel with improved machinability when compared to conventional 304 (Alloy Digest SS-418, revised September 1997) and 304L (Alloy Digest SS-513, revised November 1997). The alloys are nonhardenable austenitic chromium-nickel steels and are good general-purpose materials for simple and complex parts. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-875. Producer or source: Carpenter Specialty Alloys.

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SANDVIK 3R12/4L7

Alloy Digest ◽

10.31399/asm.ad.sa0482 ◽

1996 ◽

Vol 45 (7) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Carbon Steel ◽

Black Liquor ◽

Heat Treating ◽

304L Stainless Steel ◽

Design Load ◽

Recovery Boilers ◽

Major Application ◽

Outside Diameter

Abstract Sandvik 3R12/4L7 is a composite tube consisting of type 304L stainless steel for corrosion resistance on the outside diameter and having carbon steel (A210 Gr. A1) as the inside component for both water wetted service and the design load. The major application is tubing to handle the corrosive conditions in black liquor recovery boilers. This datasheet provides information on composition, physical properties, microstructure as well as fatigue. It also includes information on forming, heat treating, and joining. Filing Code: SA-482. Producer or source: Sandvik.

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