The corrosion behaviors of simulated archaeological iron in solution(0.06 mol·L

-1

NaCl+0.03 mol·L

-1

Na

2

SO

4

+0.01 mol·L

-1

NaHCO

3

)simulating soil water composition was investigated by potentialdynamic polariza-tion

constant potential polarization

and simulated occluded cell(O.C.)galvanostatic tests.X-ray diffraction(XRD)

energy dispersive spectrometry(EDS)

and scanning electron microscope(SEM)were used to study the corrosion morphology and the evolution of corrosion product.The objective was to discover the transformation process of archaeological iron

and determine the distribution of chlorinated corrosion products.The results showed that the presence of crevice

cavities

and channels facilitates the localized corrosion under rusts;the autocatalytic effect in-creases the concentration of Fe

2+

Cl

-

and SO

4

2-

and promotes local acidification within the crevices and cavities. Meanwhile

the phase transformation of corrosion products is concluded to proceed by means of two ways.One is that the ferrous ions are transformed into different kinds of FeOOH via the intermediate Fe(II)-Fe(III)hydroxyl-salt (

i.e

.Green Rusts);the other is that the Fe

2+

ions are transformed into FeCl

2

FeCl

3

and orange powders akaganeite at the crevices and cavities.