Final answer:
The additional corrosion protection for repaired parts includes methods like applying a metal coating for prophylactic protection, using cathodic protection, or creating protective metal alloys to prevent oxidation and corrosion.
Step-by-step explanation:
The additional corrosion protection used on the interior of repaired parts often involves a variety of methods to protect metals from oxidizing. One common method is using prophylactic protection, which includes applying a protective coating of another metal that is more resistant to oxidation, like chromium or zinc. This method is seen in chrome plating on faucets and automobile parts, as well as the galvanized layer on steel containers like "tin cans". Other measures include cathodic protection, where a more reactive metal such as zinc or magnesium is attached to protect the iron by corroding first, seen in applications like the propeller shafts of speedboats and sacrificial anodes in water heaters. Additionally, protective oxide coatings, paint coverings, and the use of metal alloys like stainless steel are also employed to combat corrosion. An example is the crystalline surface of hot-dip galvanized steel, which provides both prophylactic and cathodic protection to the underlying iron against oxidation.