総ページ数

P14

ブックの説明

出土鉄製文化財の保存処理における腐食状態の解明
Study of the corrosion for the conservation of archaeological iron objects

松井 敏也
MATSUI Toshiya
手塚 均
TEZUKA Hitoshi
及川 規
OIKAWA Tadashi
松田 泰典
MATSUDA Yasunori

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.

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