A water-based composition for treating copper or copper alloy surface for lead-free soldering, the composition comprising a compound represented by general formula (1):
wherein R
1
is hydrogen or methyl, and either R
2
and R
3
represent chlorine and R
4
and R
5
represent hydrogen, or R
2
and R
3
represent hydrogen and R
4
and R
5
represent chlorine.
A water-based composition for treating copper or copper alloy surface for lead-free soldering, the composition comprising a compound represented by general formula (1):
wherein R1 is hydrogen or methyl, and either R2 and R3 represent chlorine and R4 and R5 represent hydrogen, or R2 and R3 represent hydrogen and R4 and R5 represent chlorine.