Most of the archaeological iron objects are corroded. The iron objects deteriorate easily unless they have appropriate car after unearthed in archaeological sites. Our research focuses on
the 2 points.One point is the morphological features of various corrosion products formed on the standard steel and cast iron.
Corrosion of these specimens were accelerated by the solution of the anion (Cl⁻,SO42⁻)density that differs. Some of them have unique shapes and colors. They were classified with naked eyes, optical microscope and SEM, and characterized by X-ray microanalyses techniques and ion chromatography. As the result,it became clear that the form of the corrosion products is related to the density of chloride ion
The other point is the evaluation of some desalting treatmen methods. We checked the changes of structure of the corrosion products, and tried the comparison of NaOH-method and AC-method. Beta-FeOOH changed into Fe3O4 only a little in the AC-method. NaOH-method can be considered applicable to the extraction of sulfuric acid ion,AC-method considered applicable to the chloride ion.
出土鉄製文化財の保存処理における腐食状態の解明
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tuad-bulletin08-04-matsui
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