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HAYNES® Alloys

Aqueous Corrosion Resistance

Stress Corrosion Cracking

Alloy Time to Failure, h
HR-160® 1000 No Cracking
C-22® 1000 No Cracking
825 150 Cracked
316L SS 24 Cracked

Uniform Corrosion

- Average Corrosion Rate, mm/y*
HR-160® 625 316L SS
3% HCl + 59% HNO3, 80°C 2 20 -
1% HF + 20% HNO3, 80°C 35 123 >400
50% H2SO4 + 10% HNO3, Boiling 20 - -
60% H2SO4 + 5% HNO3, Boiling 50 105 -
65% HNO3, Boiling 9 20 12
50% H2SO4 + 42 g/l Fe2 (SO4)3 G-28A, Boiling 9 24 38
25% H2SO4 + 5% HNO3 + 4% NaCl, Boiling 3 713 -
1% HCl, Boiling 469 0.9 524
1% HCl + 1% H2SO4 + 1% HF, 79°C 107 120 245

*To convert mils per year (mpy) to mm per year, divide by 40.

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