discolorizationとは 意味・読み方・使い方

To provide a black rust prevention-treated metal in which a black rust preventive film having excellent rust preventability, maintaining the rust preventability even if flaws are generated thereon, and free of discoloration and discolorization is formed on the surface of a metallic substrate without using harmful hexavalent chromium, to provide a composition for forming a black rust preventive film, and to provide a method of forming a black rust preventive film.例文帳に追加

有害な６価クロムを使用せず、金属基体の表面に優れた防錆性を有し、防錆皮膜に傷が発生しても防錆性が維持され、変色・脱色しない黒色防錆皮膜を形成した黒色防錆処理金属、黒色防錆皮膜形成用組成物および黒色防錆皮膜形成方法の提供。 - 特許庁