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Corrosion is the [?]attack of a material by reaction with its [?]. The serious [?]of the corrosion process have become a problem of [?]significance. In addition to our everyday encounters with this form of [?], corrosion causes plant [?], waste of valuable [?], loss or contamination of product, reduction in [?], costly maintenance, and expensive [?]. It can also jeopardize safety and inhibit [?]progress.