Effect of Post Treatments on the Corrosion Resistance of Plasma Sprayed Duplex Stainless Steel Coating in Salt Water

Timo Kinos, Pentti Kettunen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The uniform composition of a thermally sprayed duplex stainless steel coatings is essential to ensure its good corrosion resistance in salt water. Stainless steel coatings made on 4130 steel substrates by atmospheric plasma spraying (APS) always contain pores and oxides accompanied with chromium-depleted zones which destroy the corrosion resistance of such coatings. To reduce porosity and oxidation of the coatings, several post treatments for the coatings sprayed by APS and by APS with gas shielding around the plasma jet (APS/S) were studied, including resin impregnation, hot isostatic pressing (HIP), shot peening and vacuum annealing. Electrochemical corrosion tests revealed that the corrosion resistance of the APS coatings could not be improved by any post treatments because oxidation during spraying caused chromium-depleted zones in the coating. The best corrosion resistance was obtained by using the shielding gas shroud with APS. Such coatings had a very low oxide content and primarily ferritic structure. The corrosion resistance of these APS/S coatings can be further improved by shot peening to densify the coatings or by post annealing, which balances the austenite /ferrite ratio of the coating as well as reduce porosity.
Original languageEnglish
Title of host publicationProceedings of the 1994 Thermal spray industrial applications
PublisherASM International
Pages537-542
Number of pages6
ISBN (Print)0-8717-0509-5
Publication statusPublished - 2 Jun 1994
MoE publication typeA4 Article in a conference publication
Event7th National thermal spray conference: Thermal spray industrial applications - Boston, United States
Duration: 2 Jun 199424 Jun 1994

Conference

Conference7th National thermal spray conference
CountryUnited States
CityBoston
Period2/06/9424/06/94

Fingerprint

Saline water
Corrosion resistance
Plasma spraying
Stainless steel
Plasmas
Coatings
Shot peening
Shielding
Chromium
Porosity
Annealing
Oxidation
Electrochemical corrosion
Plasma jets
Oxides
Sprayed coatings
Hot isostatic pressing
Spraying
Gases
Impregnation

Cite this

Kinos, T., & Kettunen, P. (1994). Effect of Post Treatments on the Corrosion Resistance of Plasma Sprayed Duplex Stainless Steel Coating in Salt Water. In Proceedings of the 1994 Thermal spray industrial applications (pp. 537-542). ASM International.
Kinos, Timo ; Kettunen, Pentti. / Effect of Post Treatments on the Corrosion Resistance of Plasma Sprayed Duplex Stainless Steel Coating in Salt Water. Proceedings of the 1994 Thermal spray industrial applications . ASM International, 1994. pp. 537-542
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Kinos, T & Kettunen, P 1994, Effect of Post Treatments on the Corrosion Resistance of Plasma Sprayed Duplex Stainless Steel Coating in Salt Water. in Proceedings of the 1994 Thermal spray industrial applications . ASM International, pp. 537-542, 7th National thermal spray conference, Boston, United States, 2/06/94.

Effect of Post Treatments on the Corrosion Resistance of Plasma Sprayed Duplex Stainless Steel Coating in Salt Water. / Kinos, Timo; Kettunen, Pentti.

Proceedings of the 1994 Thermal spray industrial applications . ASM International, 1994. p. 537-542.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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N2 - The uniform composition of a thermally sprayed duplex stainless steel coatings is essential to ensure its good corrosion resistance in salt water. Stainless steel coatings made on 4130 steel substrates by atmospheric plasma spraying (APS) always contain pores and oxides accompanied with chromium-depleted zones which destroy the corrosion resistance of such coatings. To reduce porosity and oxidation of the coatings, several post treatments for the coatings sprayed by APS and by APS with gas shielding around the plasma jet (APS/S) were studied, including resin impregnation, hot isostatic pressing (HIP), shot peening and vacuum annealing. Electrochemical corrosion tests revealed that the corrosion resistance of the APS coatings could not be improved by any post treatments because oxidation during spraying caused chromium-depleted zones in the coating. The best corrosion resistance was obtained by using the shielding gas shroud with APS. Such coatings had a very low oxide content and primarily ferritic structure. The corrosion resistance of these APS/S coatings can be further improved by shot peening to densify the coatings or by post annealing, which balances the austenite /ferrite ratio of the coating as well as reduce porosity.

AB - The uniform composition of a thermally sprayed duplex stainless steel coatings is essential to ensure its good corrosion resistance in salt water. Stainless steel coatings made on 4130 steel substrates by atmospheric plasma spraying (APS) always contain pores and oxides accompanied with chromium-depleted zones which destroy the corrosion resistance of such coatings. To reduce porosity and oxidation of the coatings, several post treatments for the coatings sprayed by APS and by APS with gas shielding around the plasma jet (APS/S) were studied, including resin impregnation, hot isostatic pressing (HIP), shot peening and vacuum annealing. Electrochemical corrosion tests revealed that the corrosion resistance of the APS coatings could not be improved by any post treatments because oxidation during spraying caused chromium-depleted zones in the coating. The best corrosion resistance was obtained by using the shielding gas shroud with APS. Such coatings had a very low oxide content and primarily ferritic structure. The corrosion resistance of these APS/S coatings can be further improved by shot peening to densify the coatings or by post annealing, which balances the austenite /ferrite ratio of the coating as well as reduce porosity.

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Kinos T, Kettunen P. Effect of Post Treatments on the Corrosion Resistance of Plasma Sprayed Duplex Stainless Steel Coating in Salt Water. In Proceedings of the 1994 Thermal spray industrial applications . ASM International. 1994. p. 537-542