Corrosion is an insidious process that tends to slowly disable or destroy that which we have created or have made an investment. Among the general axioms of corrosion are:

  1. Many technologies will produce a similar degree of protection over a given truce period, and each technololgy will have a unique cost stream over that period.

  2. The less spent on initial protection against corrosion, the more must be spent in maintenance cost later if initial "value" is to be preserved.

    Add to these a general axiom of finance:

  3. Cash flows in the future are "worth" less than cash flows in the present.

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