Corrosion Rate Conversion

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Corrosion Rate Conversion

The following charts provide a simple way to convert data between the most common corrosion units in usage, i.e. corrosion current (mA cm-2) , mass loss (g m-2 day-1) and penetration rates (mm y-1 or mpy) for all metals or for steel

mA cm-2	mm year-1	mpy	g m-2 day-1
mA cm-2	1	3.28 M/nd	129 M/nd	8.95 M/n
mm year-1	0.306 nd/M	1	39.4	2.74 d
mpy	0.00777 nd/M	0.0254	1	0.0694 d
g m-2 day-1	0.112 n/M	0.365 /d	14.4 /d	1

• where:

  • mpy = milli-inch per year

  • n = number of electrons freed by the corrosion reaction

  • M = atomic mass

  • d = density

Note: you should read the Table from left to right, i.e.:

1 mA cm-2 = (3.28 M/nd) mm y-1 = (129 M/nd) mpy = (8.95 M/n) g m-2 day-1

For example, if the metal is steel or iron (Fe), n =2, M = 55.85 g and d = 7.88 g cm-3 and the Table of conversion becomes:

mA cm-2	mm year-1	mpy	g m-2 day-1
mA cm-2	1	11.6	456	249
mm year-1	0.0863	1	39.4	21.6
mpy	0.00219	0.0254	1	0.547
g m-2 day-1	0.00401	0.0463	1.83	1

Note: you should read the Table from left to right, i.e.:

1 mA cm-2 = 11.6 mm y-1 = 456 mpy = 249 g m-2 day-1

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