The present disclosure provides a drug composition capable of preventing corrosion of components or the like made of iron that may come into contact with the drug composition in a wood treatment device for impregnating wood with a drug composition, and a method for preventing corrosion of the components or the like made of iron. In one or more embodiments, the present disclosure relates to a method for preventing corrosion of iron in a wood treatment device, including impregnating wood with a drug composition using the wood treatment device. The treatment device has a component or a portion made of iron that comes into contact with the drug composition, and the drug composition is an aqueous solution composition containing an iodopropynyl carbamate compound and an organic acid salt of quaternary ammonium.【課題】本開示は、薬剤組成物を木材に浸透させるための木材の処理装置において、薬剤組成物と接触しうる鉄製の部品等の腐食を防止できる薬剤組成物及び該鉄製の部品等の腐食防止方法を提供する。【解決手段】一又は複数の実施形態において、木材処理装置を用いて薬剤組成物を木材に浸透させることを含み、前記処理装置は、前記薬剤組成物と接触する鉄製の部品又は部分を備え、前記薬剤組成物が、カルバミン酸ヨードプロピニル化合物と、第四級アンモニウムの有機酸塩とを含む水性溶液組成物である、木材処理装置における鉄の防食方法。【選択図】なし
