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$6.$ Copper and steel pipes carrying water were connected together with an electrically insulating connector. Everything was painted with a good layer of aluminum paint so that no exterior corrosion occurred, but internally the steel corroded badly.

$($a$)$ How could a galvanic corrosion cell have been set up$?$

$($b$)$ If a layer of organic paint instead of aluminum paint is used, will steel pipe corrode so badly?

Will steel pipe still corrode? Explain by sketch a polarization diagram.