This invention discloses a cationic electrodeposition paint composition
containing an amino group-containing modified epoxy resin which is
obtained through reaction of specific modified epoxy resin with xylene
formaldehyde resin having phenolic hydroxyl groups and amino
group-containing compound. The cationic electrodeposition paint
composition excels in film thickness retention, finished appearance of
coating film and electrocoatability of galvanized alloy steel sheet and
can form coating film having good corrosion resistance, even when its
content of volatile organic compound (VOC) is reduced.