Erosion-corrosion resistance of various stainless steel grades in high-temperature sulfuric acid solution

Mari Lindgren, Sanna Siljander, Reija Suihkonen, Pekka Pohjanne, Jyrki E. Vuorinen

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

Two austenitic stainless steel grades, 316L and 904L, and three duplex stainless steel grades, LDX 2101, 2205, and 2507, were erosion-corrosion tested as impeller blade materials for hydrometallurgical applications. Samples were attached to the pressure and suction sides of an impeller and were tested in 50 g/l H2SO4 and 0.5 g/l Fe2(SO4)3 for 72 h at 80°C and 95 °C in a small-scale reactor using quartz sand slurry. The results showed that under lower erosion intensity the ranking of the grades was similar to that in pure erosion. Under higher erosion intensity the ranking of the grades changed completely: lean alloys LDX 2101 and 316L suffered from the highest mass losses followed by 2205, 2507, and 904L. To clarify this behavior, the ability of the grades to repassivate was investigated with scratch tests. It was found that the ranking could be explained by the repassivation rates. The only exception was that 2507 showed a similar repassivation rate to 904L but its erosion-corrosion mass loss under higher erosion intensity was larger. One contributing factor to this was found to be the selective dissolution of the austenite phase of all the tested duplex grades. The prerequisites for the galvanic coupling between the phases that was responsible for the selective dissolution are discussed.
Original languageEnglish
Pages (from-to)10-21
JournalWear
Volume364-365
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Stainless Steel
sulfuric acid
Sulfuric acid
corrosion resistance
erosion
Corrosion resistance
stainless steels
Erosion
grade
Stainless steel
ranking
Temperature
corrosion
dissolving
Dissolution
rotor blades (turbomachinery)
Corrosion
Quartz
austenitic stainless steels
suction

Keywords

  • erosion-corrosion
  • slurry
  • stainless steels
  • sulfuric acid
  • wear

Cite this

Lindgren, Mari ; Siljander, Sanna ; Suihkonen, Reija ; Pohjanne, Pekka ; Vuorinen, Jyrki E. / Erosion-corrosion resistance of various stainless steel grades in high-temperature sulfuric acid solution. In: Wear. 2016 ; Vol. 364-365. pp. 10-21.
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abstract = "Two austenitic stainless steel grades, 316L and 904L, and three duplex stainless steel grades, LDX 2101, 2205, and 2507, were erosion-corrosion tested as impeller blade materials for hydrometallurgical applications. Samples were attached to the pressure and suction sides of an impeller and were tested in 50 g/l H2SO4 and 0.5 g/l Fe2(SO4)3 for 72 h at 80°C and 95 °C in a small-scale reactor using quartz sand slurry. The results showed that under lower erosion intensity the ranking of the grades was similar to that in pure erosion. Under higher erosion intensity the ranking of the grades changed completely: lean alloys LDX 2101 and 316L suffered from the highest mass losses followed by 2205, 2507, and 904L. To clarify this behavior, the ability of the grades to repassivate was investigated with scratch tests. It was found that the ranking could be explained by the repassivation rates. The only exception was that 2507 showed a similar repassivation rate to 904L but its erosion-corrosion mass loss under higher erosion intensity was larger. One contributing factor to this was found to be the selective dissolution of the austenite phase of all the tested duplex grades. The prerequisites for the galvanic coupling between the phases that was responsible for the selective dissolution are discussed.",
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author = "Mari Lindgren and Sanna Siljander and Reija Suihkonen and Pekka Pohjanne and Vuorinen, {Jyrki E.}",
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Erosion-corrosion resistance of various stainless steel grades in high-temperature sulfuric acid solution. / Lindgren, Mari; Siljander, Sanna; Suihkonen, Reija; Pohjanne, Pekka; Vuorinen, Jyrki E.

In: Wear, Vol. 364-365, 2016, p. 10-21.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Erosion-corrosion resistance of various stainless steel grades in high-temperature sulfuric acid solution

AU - Lindgren, Mari

AU - Siljander, Sanna

AU - Suihkonen, Reija

AU - Pohjanne, Pekka

AU - Vuorinen, Jyrki E.

PY - 2016

Y1 - 2016

N2 - Two austenitic stainless steel grades, 316L and 904L, and three duplex stainless steel grades, LDX 2101, 2205, and 2507, were erosion-corrosion tested as impeller blade materials for hydrometallurgical applications. Samples were attached to the pressure and suction sides of an impeller and were tested in 50 g/l H2SO4 and 0.5 g/l Fe2(SO4)3 for 72 h at 80°C and 95 °C in a small-scale reactor using quartz sand slurry. The results showed that under lower erosion intensity the ranking of the grades was similar to that in pure erosion. Under higher erosion intensity the ranking of the grades changed completely: lean alloys LDX 2101 and 316L suffered from the highest mass losses followed by 2205, 2507, and 904L. To clarify this behavior, the ability of the grades to repassivate was investigated with scratch tests. It was found that the ranking could be explained by the repassivation rates. The only exception was that 2507 showed a similar repassivation rate to 904L but its erosion-corrosion mass loss under higher erosion intensity was larger. One contributing factor to this was found to be the selective dissolution of the austenite phase of all the tested duplex grades. The prerequisites for the galvanic coupling between the phases that was responsible for the selective dissolution are discussed.

AB - Two austenitic stainless steel grades, 316L and 904L, and three duplex stainless steel grades, LDX 2101, 2205, and 2507, were erosion-corrosion tested as impeller blade materials for hydrometallurgical applications. Samples were attached to the pressure and suction sides of an impeller and were tested in 50 g/l H2SO4 and 0.5 g/l Fe2(SO4)3 for 72 h at 80°C and 95 °C in a small-scale reactor using quartz sand slurry. The results showed that under lower erosion intensity the ranking of the grades was similar to that in pure erosion. Under higher erosion intensity the ranking of the grades changed completely: lean alloys LDX 2101 and 316L suffered from the highest mass losses followed by 2205, 2507, and 904L. To clarify this behavior, the ability of the grades to repassivate was investigated with scratch tests. It was found that the ranking could be explained by the repassivation rates. The only exception was that 2507 showed a similar repassivation rate to 904L but its erosion-corrosion mass loss under higher erosion intensity was larger. One contributing factor to this was found to be the selective dissolution of the austenite phase of all the tested duplex grades. The prerequisites for the galvanic coupling between the phases that was responsible for the selective dissolution are discussed.

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KW - slurry

KW - stainless steels

KW - sulfuric acid

KW - wear

U2 - 10.1016/j.wear.2016.06.007

DO - 10.1016/j.wear.2016.06.007

M3 - Article

VL - 364-365

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