Removal of Oxide Scale

How would you translate "脱落した酸化スケール"?

Let's break it down:

• 脱落した酸化スケール
• 脱落 【だつらく】 loss; dropping out; falling by the wayside
• 酸化 【さんか】 oxidation

The original translation I saw was:

• scale oxide dropped from the metal surface

The problem with this translation is the direct translation of 脱落 as "dropped." A better translation would be "oxide scale is removed from the metal surface" or "waste oxide scale is removed from the metal surface."

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References:

• WWWJDIC: Online Japanese Dictionary Service 
• Casio Ex-Word 電子辞書 
• The American Heritage Dictionary of the English Language 
• 英辞郎 第五版 
• 新和英大辞典　第5版 ― 並装 
• Transmission electron microscopy of thin oxide layers recovered from the surface of metals 
• Oxide Scale Behavior in High Temperature Metal Processing by Michal Krzyzanowski, John H. Beynon, Didier C. J. Farrugia