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Resistance to Acids

Corrosion Rates of Cold-worked (40%) Sheet in Aqueous Solutions of Common Acids

Acid Concentration Temperature Corrosion Rate
wt% °F °C mpy mm/y
Hydrochloric 1 Boiling 0.4 0.01
5 175 79 30.0 0.76
10 100 38 <0.1 <0.01
20 100 38 7.2   0.18
Hydrobromic 5 200 93 1.7 0.04
Nitric 20 Boiling 1.7 0.04
40 175 79 2.1 0.05
60 175 79 4.7 0.12
Hydrofluoric 5 125 52 0.48 0.48
Phosphoric 60 Boiling 4.7 0.12
Chromic 10 150 66 5.1 0.13
Sulfuric 10 200 93 3.8 0.10
20 200 93 2.8 0.07
30 200 93 6.8 0.17
40 175 79 1.1 1.1
50 175 79 13.1 0.03
60 150 66 0.3 0.33
70 150 66 3.1 0.01
80 150 66 4.8 0.12
90 150 66 1.3 0.03
ASTM G-28A* - Boiling 42.4 1.08
ASTM G-28B** - Boiling 9.8 0.25

*ASTM G-28A = 50% H2SO4 + 42 g/l Fe2(SO4)3
**ASTM G-28B = 23% H2SO4 + 1.2% HCl + 1% Fe3Cl + 1% CuCl2

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