Corrosion Rate Calculator

Calculate corrosion rate (mpy) from weight loss coupon data per NACE standards

Mass loss of the corrosion coupon after cleaning per NACE SP0775 / ASTM G1. Initial weight minus final weight after removing corrosion products.
grams
Total exposed surface area. For rectangular coupon: 2(LW + LH + WH). Standard 1x3 inch coupon is approximately 9.68 cm2.
cm2
Total time the coupon was exposed. NACE RP0775 recommends minimum 30 days for reliable oilfield results.
days
Carbon steel (1018): 7.86. 304 SS: 8.00. 316 SS: 8.03. Alloy 625: 8.44. Copper: 8.89 g/cm3.
g/cm3
If provided, calculates estimated remaining life based on measured corrosion rate. Enter nominal or measured wall thickness.
inches

Results

Corrosion Rate-mpy
Corrosion Rate-mm/yr
Severity Classification-
Metal Loss per Year-mils
Estimated Remaining Life-years
References & Formulas:
CR (mpy) = (K × W) / (A × T × D)
K = 22,300 (for mpy with grams, cm2, days, g/cm3)
W = weight loss, A = area, T = time, D = density
mm/yr = mpy × 0.0254
NACE Severity: <1 Low | 1-5 Moderate | 5-10 High | >10 Severe

NACE SP0775, ASTM G1-03, NACE MR0175/ISO 15156.