サビから金属を守る!鉄など金属のサビ止め・錆防止が手軽で清潔!
防錆紙を少量から販売!
買い物カゴを見る

錆と戦い続けるオヤジのコラム

「NO.17」Mistake-prone basic knowledge on the anticorrosive paper No. 2 

カテゴリ:【防錆油と防錆紙の違い防錆紙の使い方

Don't you have a concern that you had better pay attention on the volatile corrosion inhibitor employed in VCI Paper, and therefore it eventually becomes just paper? Alternatively, don't you have an expectation that there is a sufficient effect even in a place away from, because the volatile corrosion inhibitor is employed in VCI Paper? 

What do you think of when you have heard "Volatile"? For example, do you think of Alcohol to be used prior to injection for disinfection or Fragrance to be put the toilet?

Both, it will run out if you do not tightly sealed by the cap.  The reason is that highly volatile substance is used in both of these. Well, what about the water? Indeed, the water placed in a cup without the lid, the volume is reduced by evaporation and will get lost. However, it would not be fast enough to disappear between viewing. Well, how about the hot water after adding heat?  I think you can feel this time the volume is reduced between viewing. 

Now, let me explain what happens in the case of VCI Paper. Please refer to Figure 2. 

This figure shows the relationship between the vapor pressure of various substances such as the volatile corrosion inhibitor and the temperature. It is shown by taking the temperature on the horizontal axis and the vapor pressure on the vertical axis on a logarithmic scale. One scale becomes 10 times because of logarithmic scale. You can see any substance has become a curve of upward-sloping. This is due to the vapor pressure increases as the temperature is high. 

The curve drawn to the top shows the water. Previously, I referred water and hot water as an example. The vapor pressure is larger an order of magnitude, 10 times, when 20℃ water is heated up to 60hot water. This fact shows that it is easy to vaporize when the vapor pressure is large.   

DICHAN, a representative of volatile corrosion inhibitor, is under 4~5 degree than the water. In other words, it indicates the vapor pressure of DICHAN is in the magnitude of one of 10,000~100,000th of the water.  The vapor pressure of DICHAN is smaller than the mercury, which is famous because this metal is vaporized but now is lost to be seen. This vapor pressure is 3 digits smaller than Camphor which is put in the closet as insect repellent. Can you see that it is not so much immediately disappearing even though that DICHAN is vaporizing? 

Although the vapor pressure of the substances used in VCI Paper is not known to all, the vapor pressure would be greater than DICHAN in the extent about one order of magnitude, even though likely to be vaporized. 

If you had the image that "volatile corrosion inhibitor" would easily vaporize more and more when you hear it. It may be influenced and dragged by the word "volatile".
I do hope you make rational judgment by having the correct knowledge, rather than sensuous.

17回 figure2.JPG 

 

■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。
防錆について、防錆紙についてなど、サビに関する事なら何でもお問い合わせ下さい!防錆油より手軽に防錆したい、自社製品の材質にあった防錆紙の提案がほしい、防錆フィルムより強い防錆力が欲しい、そんなお困りごとを解決します!お気軽にご相談ください。お問合せフォームはこちら
ページトップへ