What is the limit for light corrosion?

What is the limit for light corrosion?

• A. A depth of approximately one mil (0.001 inch).
• B. A depth of approximately ten mil (0.010 inch).
• C. A depth of approximately one micron (0.00004 inch).
• D. A depth of approximately 0.1 inch.

Answer: (A)

Light corrosion is considered shallow enough to be cleaned and treated without removing much material, and the standard depth limit used is about 0.001 inch, which is one mil. If corrosion penetrates deeper than that, it moves into moderate or more severe categories and would require more extensive repair or replacement. The option of about 0.010 inch is too deep for light corrosion, the micron value is far smaller than the typical threshold used for classification, and 0.1 inch is far beyond practical limits for structural integrity. So the best choice is a depth of approximately one mil.

Light corrosion is considered shallow enough to be cleaned and treated without removing much material, and the standard depth limit used is about 0.001 inch, which is one mil. If corrosion penetrates deeper than that, it moves into moderate or more severe categories and would require more extensive repair or replacement. The option of about 0.010 inch is too deep for light corrosion, the micron value is far smaller than the typical threshold used for classification, and 0.1 inch is far beyond practical limits for structural integrity. So the best choice is a depth of approximately one mil.