Influence of the freeze-thaw corrosive environment exerted on the pitting corrosion of sus304 stainless steels with weldment and improvement of the corrosion resistance

Additively manufactured (AM) stainless steels exhibit numerous microstructural differences compared to their wrought counterparts, such as Cr enriched dislocation cell structures. The influence these unique features have on a SSs corrosion resistance are still under investigation with most current works limited to laboratory experiments. The work herein shows the first documented study of AM 304L and 316L exposed to a severe marine environment on the eastern coast of Florida with comparisons made to wrought counterparts. Coupons were exposed for 21 months and resulted in significant pitting corrosion to initiate after 1 month of exposure for all conditions. At all times, the AM coupons exhibited lower average and maximum pit depths than their wrought counterparts. After 21 months, pits on average were 4 μm deep for AM 316L specimen and 8 μm deep for wrought specimen. Pits on the wrought samples tended to be nearly hemispherical and polished with some pits showing crystallographic attack while pits on AM coupons exhibited preferential attack at melt pool boundaries and the cellular microstructure.

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ChemInform Abstract: The Pitting Corrosion Resistance of Silicon-Implanted Stainless Steels

ChemInform ◽

10.1002/chin.199226018 ◽

2010 ◽

Vol 23 (26) ◽

pp. no-no

Author(s):

J. BASZKIEWICZ ◽

M. KAMINSKI ◽

A. PODGORSKI ◽

J. JAGIELSKI ◽

G. GAWLIK

Keyword(s):

Corrosion Resistance ◽

Pitting Corrosion ◽

Stainless Steels ◽

Pitting Corrosion Resistance

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Effect of Tantalum Addition on Inclusion Formation and Pitting Corrosion Resistance of Super Duplex Stainless Steels

ECS Meeting Abstracts ◽

10.1149/ma2015-01/12/1056 ◽

2015 ◽

Keyword(s):

Corrosion Resistance ◽

Pitting Corrosion ◽

Stainless Steels ◽

Duplex Stainless Steels ◽

Inclusion Formation ◽

Pitting Corrosion Resistance ◽

Super Duplex Stainless Steels

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Development of new approaches to the study of pitting corrosion resistance of stainless steels obtained by selective laser melting

E3S Web of Conferences ◽

10.1051/e3sconf/201912101011 ◽

2019 ◽

Vol 121 ◽

pp. 01011

Author(s):

Olga Parmenova ◽

Svetlana Mushnikova ◽

Vitaliy Bobyr ◽

Evgeniy Samodelkin

Keyword(s):

Corrosion Resistance ◽

Selective Laser Melting ◽

Pitting Corrosion ◽

Stainless Steels ◽

Laser Scanning ◽

Corrosion Behaviour ◽

Steel Corrosion ◽

Scanning Speed ◽

Laser Melting ◽

Initial State

This paper presents the results of comparative corrosion resistance studies of stainless steels manufactured by selective laser melting (SLM) in the initial state with subsequent heat treatment and machining. Pitting corrosion tests are carried out, according to ASTM G48 method A in 10% FeCl3·6H2O solution at elevated temperature and exposure time for 5h. The studies were performed on the AISI 321 and AISI 316L stainless steels manufactured by SLM. It was obtained that laser scanning speed decrease led to density rise by other SLM parameters being equal. Porosity affected to the stainless steel corrosion behaviour significant. Metal density decrease resulted to corrosion rate rise. Microstructure examination showed that pitting corrosion development depended on surface steel condition.

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