The atmospheric corrosion rates of steel were measured in an industrial district (Kôtô-ku) of Tokyo, Japan.
Analyzing correlations between the corrosion rates and meteorological factors and/or atmospheric pollution substance factors by means of statistical analysis method, a corrosion regression was obtained to describe the influence of these two mutual interacting factors on corrosion of steel.
The result may be expressed as:
y=-136.91+0.05x
1+2.56x
2+0.12x
3+3.60x
4+(-24.63)x
5+2.0x
6+(-14.37)x
7+13.43x
8+3.65x
9+(-1351.99)x
10where,
y: corrosion rate (mdd),
x1: temperature (°C),
x2: humidity (RH%),
x3: precipitation (mm),
x4: sulfur dioxide (mg/day·100cm
2),
x5: sea-salt particles (chlorides) (mg/100cm
2),
x6: wind velocity (m/sec),
x7: soluble substances (g),
x8: insoluble substances (g),
x9: sulfates (g),
x10: tar substances (g).
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