Corrosion of high-alloy stainless steels in the wet phosphoric acid

Outi Varjonen

Research output: Book/ReportReportProfessional

Abstract

At present type AISI 316 stainless steel is most widely used stainless steel in wet phosphoric acid environment. However, the acid manufacturing process involves more and more impurities such as chlorides and free fluorides which leads to increasing corrosion resistance requirements for materials. The high-alloy stainless can be utilised in concentrated part of the wet phosphoric acid process due to their good localised and uniform corrosion resistance. For example, Sanicro 28 stainless steel has been developed to resolve the corrosion problems in wet phosphoric acid. For this report the applicability of the high-alloy stainless steels for use in wet concentrated phosphoric acid environment is investigated. A literature survey of the corrosion resistance of the high-alloy stainless steels in wet phosphoric acid containing chloride and fluoride impurities is made and experiments involving both weight loss and electrochemical measurements are carried out. The high-alloy stainless steels are entirely corrosion resistant in wet phosphoric acid at a temperature of 70 °C. However, increase in temperature accelerates the corrosion of steels considerably and at 110 °C all of them suffer from active dissolution having corrosion rates higher than 100 my m/a.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages52
ISBN (Print)951-38-3372-0
Publication statusPublished - 1989
MoE publication typeD4 Published development or research report or study

Publication series

NameTutkimuksia / Valtion teknillinen tutkimuskeskus
PublisherVTT
Volume588

Fingerprint

Stainless Steel
Alloy steel
Corrosion
Corrosion resistance
Fluorides
Chlorides
Impurities
Steel
Corrosion rate
phosphoric acid
Dissolution
Temperature
Acids
Experiments

Keywords

  • stainless steels
  • corrosion
  • phospheric acid

Cite this

Varjonen, O. (1989). Corrosion of high-alloy stainless steels in the wet phosphoric acid. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 588
Varjonen, Outi. / Corrosion of high-alloy stainless steels in the wet phosphoric acid. Espoo : VTT Technical Research Centre of Finland, 1989. 52 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 588).
@book{810160f57bdd4421aebb3d122214259d,
title = "Corrosion of high-alloy stainless steels in the wet phosphoric acid",
abstract = "At present type AISI 316 stainless steel is most widely used stainless steel in wet phosphoric acid environment. However, the acid manufacturing process involves more and more impurities such as chlorides and free fluorides which leads to increasing corrosion resistance requirements for materials. The high-alloy stainless can be utilised in concentrated part of the wet phosphoric acid process due to their good localised and uniform corrosion resistance. For example, Sanicro 28 stainless steel has been developed to resolve the corrosion problems in wet phosphoric acid. For this report the applicability of the high-alloy stainless steels for use in wet concentrated phosphoric acid environment is investigated. A literature survey of the corrosion resistance of the high-alloy stainless steels in wet phosphoric acid containing chloride and fluoride impurities is made and experiments involving both weight loss and electrochemical measurements are carried out. The high-alloy stainless steels are entirely corrosion resistant in wet phosphoric acid at a temperature of 70 °C. However, increase in temperature accelerates the corrosion of steels considerably and at 110 °C all of them suffer from active dissolution having corrosion rates higher than 100 my m/a.",
keywords = "stainless steels, corrosion, phospheric acid",
author = "Outi Varjonen",
year = "1989",
language = "English",
isbn = "951-38-3372-0",
series = "Tutkimuksia / Valtion teknillinen tutkimuskeskus",
publisher = "VTT Technical Research Centre of Finland",
address = "Finland",

}

Varjonen, O 1989, Corrosion of high-alloy stainless steels in the wet phosphoric acid. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 588, VTT Technical Research Centre of Finland, Espoo.

Corrosion of high-alloy stainless steels in the wet phosphoric acid. / Varjonen, Outi.

Espoo : VTT Technical Research Centre of Finland, 1989. 52 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 588).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Corrosion of high-alloy stainless steels in the wet phosphoric acid

AU - Varjonen, Outi

PY - 1989

Y1 - 1989

N2 - At present type AISI 316 stainless steel is most widely used stainless steel in wet phosphoric acid environment. However, the acid manufacturing process involves more and more impurities such as chlorides and free fluorides which leads to increasing corrosion resistance requirements for materials. The high-alloy stainless can be utilised in concentrated part of the wet phosphoric acid process due to their good localised and uniform corrosion resistance. For example, Sanicro 28 stainless steel has been developed to resolve the corrosion problems in wet phosphoric acid. For this report the applicability of the high-alloy stainless steels for use in wet concentrated phosphoric acid environment is investigated. A literature survey of the corrosion resistance of the high-alloy stainless steels in wet phosphoric acid containing chloride and fluoride impurities is made and experiments involving both weight loss and electrochemical measurements are carried out. The high-alloy stainless steels are entirely corrosion resistant in wet phosphoric acid at a temperature of 70 °C. However, increase in temperature accelerates the corrosion of steels considerably and at 110 °C all of them suffer from active dissolution having corrosion rates higher than 100 my m/a.

AB - At present type AISI 316 stainless steel is most widely used stainless steel in wet phosphoric acid environment. However, the acid manufacturing process involves more and more impurities such as chlorides and free fluorides which leads to increasing corrosion resistance requirements for materials. The high-alloy stainless can be utilised in concentrated part of the wet phosphoric acid process due to their good localised and uniform corrosion resistance. For example, Sanicro 28 stainless steel has been developed to resolve the corrosion problems in wet phosphoric acid. For this report the applicability of the high-alloy stainless steels for use in wet concentrated phosphoric acid environment is investigated. A literature survey of the corrosion resistance of the high-alloy stainless steels in wet phosphoric acid containing chloride and fluoride impurities is made and experiments involving both weight loss and electrochemical measurements are carried out. The high-alloy stainless steels are entirely corrosion resistant in wet phosphoric acid at a temperature of 70 °C. However, increase in temperature accelerates the corrosion of steels considerably and at 110 °C all of them suffer from active dissolution having corrosion rates higher than 100 my m/a.

KW - stainless steels

KW - corrosion

KW - phospheric acid

M3 - Report

SN - 951-38-3372-0

T3 - Tutkimuksia / Valtion teknillinen tutkimuskeskus

BT - Corrosion of high-alloy stainless steels in the wet phosphoric acid

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Varjonen O. Corrosion of high-alloy stainless steels in the wet phosphoric acid. Espoo: VTT Technical Research Centre of Finland, 1989. 52 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 588).