[cs_content][cs_section parallax=”false” separator_top_type=”none” separator_top_height=”50px” separator_top_angle_point=”50″ separator_bottom_type=”none” separator_bottom_height=”50px” separator_bottom_angle_point=”50″ style=”margin: 0px;padding: 45px 0px;”][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]Shipwrecks and Salvage > 2. Corrosion of Iron >
Account for the differences in corrosion of active and passivating metals [/cs_text][/cs_column][/cs_row][/cs_section][cs_section parallax=”false” separator_top_type=”none” separator_top_height=”50px” separator_top_angle_point=”50″ separator_bottom_type=”none” separator_bottom_height=”50px” separator_bottom_angle_point=”50″ style=”margin: 0px;padding: 45px 0px;”][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]
- Only a few metals exist in nature as uncombined elements, such as gold and silver.
- Such noble metals do not corrode.
- Active Metal: A reactive metal that forms a non-adherent and porous oxide layer.
- The oxide layer of active metals can flake off, allowing continued corrosion.
- Most metals are active metals and exist in nature as compounds.
- Passivating Metal: A reactive metal that readily forms an unreactive surface coating with substances such as oxygen or water, thus protecting the metal from further reaction.
- Passive metals therefore only corrode to a certain extent.
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