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「No.3」Why does rust cause? 【About Oxidation and Reduction】

カテゴリ:【防錆紙の使い方

As a correct term, "RUST" is used for "Iron" only, while "CORROSION" is used for whole metals including iron. But in this article, it is unified with RUST to make it easier to read for our customers. Also, there is some place which should be explained "xxx MOLECULAR" and "xxx ATOM" in the strict sense.

 As the theory of this world, all objects change to a more stable state. For example, if you chill the water at room temperature, it becomes ice at 0°C (from liquid to solid), and steam if heated at 100°C (from liquid to gas). There is no "100°C ice" (solid water) in typical living environment. Because solid water is unstable at 100°C. In high altitude areas such as the top of the mountain, water boils at below 100°C.  Because of the effect that the atmospheric pressure has lowered, the water is more stable by changing to steam at 100°C or less (water vaporization).

 Then, why the metal rust? The reason is very simple, rusty state is stable, while the state not rust is unstable for metal. Because of the needs of metal in its unstable condition, we have been studying for the rust prevention treatment and rust prevention packaging.

 Here, we will explain for the iron as an example. Iron exists in the natural world as an iron ore (stable for iron). There are many iron sulfide states, but the story is complicated, so we omit them in this time. Speaking of the iron ore dare simply, it is a mass of rust. Because rust is composed mainly "iron + oxygen", "iron" is left by removing "oxygen". However, as described earlier, because the iron itself is unstable in the natural world, iron ties to return to the state of rust by reacting with the air (stable state for iron).

第3回英語-1.JPG

The reaction which becomes rust is "Oxidation-Reduction reaction" which combines "Oxidation reaction" and "Reduction reaction". This oxidation reaction and reduction reaction are not happened by one of them only. It always happens both. The definition of "oxidation" and "reduction" as follows.

第3回英語-2.JPG

第3回英語-3.JPG

Iron(II) Hydroxide can be made with the resulting of one Iron(II) ion and two Hydroxide ions. It is the familiar "RUST" that this reacts further and becomes Iron(III) Hydroxide.
Simply referred to as "Rust of Iron", "Iron(II) hydroxide" or "Iron(III) oxide-hydroxide" and " Iron(II, III) oxide" are different substances that can be made by the environment in which the metal is located, and their properties (colors, etc.) are different.

 

"Smell of RUST" will be explained in No.5.

■著者情報

  • 名前
    清水良直(しみずよしなお)
  • 略歴
    長野県出身1947年生まれ
    大学で界面化学を履修し,ごく微量の化学物質によるさまざまな現象に興味をおぼえた。
    社会人になって6年目に「防錆紙(ぼうせいし)」と出会い,金属のサビをごく微量の化学物質で防止する技術に感動。 以来,社内での出世を棒に振ってまで,研究や新製品の開発に従事しながら,業界団体での活動にも参加。
    会社を辞めた後も業界団体の教育活動「防錆技術学校」の講師として,防錆管理士を目指す若者の教育・指導を継続。
    2002年、アドコートの技術顧問に就任。
  • 主な雑誌投稿や著作
    防錆管理……防錆紙に関する解説記事,研究発表など
    コンバーテック……「防錆包装再考」シリーズ
    防錆技術学校……「気化性防錆材」などの教科書
  • 日本工業規格の制定・改正
    JIS Z 0303,JIS Z 1535,JIS Z 1519,JIS Z 0320,JIS Z 0321
  • 防錆についての想い
    金属製品の一時防錆にかかわってきた経験や技術をつうじて社会に貢献するとともに, 技術を伝承することによって後輩たちの育成に努めたい。
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