GALVANIC CORROSION OF RUSTY CAST IRON AND 304 STAINL ESS STEEL

Cor Sci Pro Tech

2001, Vol. 13

Issue (2): 66-70 DOI:

Research Report

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GALVANIC CORROSION OF RUSTY CAST IRON AND 304 STAINL ESS STEEL

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Abstract To know galvanic effect of aging iron artifacts and supporting stainless steel plate, galvanic corrosion characteristic of rusty cas t iron and 304 stainless steel (SS304) in the 3.5%NaCl solution have been studie d.The influence of area ratio of the two materials on the galvanic effect has al so been investigated. The results indicate that the galvanic current of rusty ca st iron and SS304 is dependent on cathodic reaction rate on the surface of SS304 at galvanic potential when SS304/rusty cast iron area ratio S≤16. Furtherm ore,as the area ratio increases, galvanic current density Ig/Aa incr eases. But Ig/Ac reduces and is limited to oxygen diffusion limiting current density on the surface of SS304. With the increasing area ratio, galvan ic effects rise but in general they are comparatively little in comparison with counterpart of common coupled metals. When the area ratio is too high, SS304, wh ich is passive itself and then is activated after being coupled, may be suffer f rom cathodic corrosion. Therefore, area ratio S must not be too big in pract ical engineering. It is suggested that S≤4.

Key words: rusty cast iron SS304 galvanic corrosion

Received: 01 January 1900

TG172.2

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. GALVANIC CORROSION OF RUSTY CAST IRON AND 304 STAINL ESS STEEL. Cor Sci Pro Tech, 2001, 13(2): 66-70 .

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https://www.cspt.org.cn/EN/ OR https://www.cspt.org.cn/EN/Y2001/V13/I2/66

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