Sunday, May 14, 2017

Common names for chemicals and selection of appropriate stainless steel grades

Introduction

The table is referenced by the common name.
The 'appropriate grades' notes are taken from the Avesta Sheffield Corrosion Handbook and are shown for general guidance only.
Specific grade selections should be rechecked with corrosion tables. A link to the BSSA web site article that describes where to find the corrosion tables on the Outokumpu Stainless web site can be found in the Related Links section of this article.

 

Common chemical names

Common name

Chemical name

Formula

Grade selection

alum

potassium aluminium sulphate

KAl(SO4)2

304 or 316 useful at all concentrations, up to 50C

aqua fortis

nitric acid

HNO3

Selection of stainless steels for handling nitric acid (HNO3)

aqua regia

nitric and hydrochloric acid mixture

HNO3 and HCl

Likely to attack most stainless steels This mixture is used for dissolving gold.

bleach

sodium hypochlorite

NaOCl

Selection of stainless steels for handling sodium hypochlorite (NaOCl) - Bleach

caustic potash

potassium hydroxide

KOH

similar selection as for sodium hydroxide

caustic soda

sodium hydroxide

NaOH

Selection of stainless steels for handling sodium hydroxide (NaOH)

chromic acid

chromium trioxide

CrO3

304 or 316 useful up to 40%, 20C

ethanol (alcohol)

ethyl alcohol

C2H5OH

304 or 316 useful at all concentrations, up to boiling point

glycol

ethylene glycol (anti-freeze preparations)

C2H4(OH)2

304 or 316 useful at all concentrations at ambient (or lower) temperatures

gypsum

calcium sulphate

CaSO4

304 or 316 useful at all concentrations, up to boiling point

Javelle (javel) water

sodium hypochlorite

NaOCl

Selection of stainless steels for handling sodium hypochlorite (NaOCl) - Bleach

Labarraque's solution

sodium hypochlorite

NaOCl

Selection of stainless steels for handling sodium hypochlorite (NaOCl) - Bleach

marine acid

hydrochloric acid

HCl

Selection of stainless steels for handling hydrochloric acid (HCl)

methanol (alcohol)

methyl alcohol

CH3OH

304 or 316 useful at all concentrations, up to boiling point

muriatic acid

hydrochloric acid

HCl

Selection of stainless steels for handling hydrochloric acid (HCl)

oil of vitriol

sulphuric acid

H2SO4

Selection of stainless steels for handling sulphuric acid (H2SO4)

oleum

concentated sulphuric acid

H2SO4

Selection of stainless steels for handling sulphuric acid (H2SO4)

rock salt

sodium chloride

NaCl

Crevice and pitting corrosionhazard with most stainless steels, depending on conditions

salt acid

hydrochloric acid

HCl

Selection of stainless steels for handling hydrochloric acid (HCl)

spirit of salt

hydrochloric acid

HCl

Selection of stainless steels for handling hydrochloric acid (HCl)

sulphurated hydrogen

hydrogen sulphide

H2S

Can be a pitting or (stress corrosion cracking hazard) to non-molybedum alloyed stainless grades

wood acid

acetic acid (mainly)

CH3COOH

Selection of stainless steels for handling acetic acid (CH3COOH)

 

Source: http://www.bssa.org.uk/

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