Cleaning composition for metal articles

A method of cleaning a metal article, the method comprising a cleaning step of cleaning a metal article using a cleaning composition for metal articles comprising:

• an amine (component A) represented by a general formula (I):
• wherein R1 and R2 each independently represent a hydrogen atom, an alkyl group having 1 or more and 6 or less carbon atoms, a phenyl group, a benzyl group, an aminoethyl group, a hydroxyethyl group, or a hydroxypropyl group and R3 represents a hydroxyethyl group or a hydroxypropyl group;
• a nonionic surfactant (component B) represented by
• a general formula (II):
• R4—O—{(EO)n1/(PO)m1}—H (II)
• wherein R4 represents an alkyl group having 12 or more and 16 or less carbon atoms, EO represents an ethyleneoxy group, PO represents a propyleneoxy group, n1 represents an average number of moles of EO added, m1 represents an average number of moles of PO added, n1 is a number of 2 or more and 20 or less, m1 is a number of 0 or more and 20 or less, and a form of the PO added and the EO added shown in { } is optionally a random arrangement or a block arrangement;
• a nitrogen-containing nonionic surfactant (component C) represented by a general formula (III):
• wherein R5 represents an alkyl group or a cycloalkyl group having 8 or more and 18 or less carbon atoms on average, EO represents an ethyleneoxy group, PO represents a propyleneoxy group, n2 represents an average number of moles of EO added, m2 represents an average number of moles of PO added, n2 is a number of 1 or more and 8 or less, m2 is a number of 0 or more and 8 or less, and a form of the PO added and the BO added shown in { } is optionally a random arrangement or a block arrangement;
• and
• water (component D),
• the cleaning composition having a pH of 7.1 or more,
• wherein a mass ratio of the component B to the component C (a mass of the component B/a mass of the component C) is 0.001 or more and 100 or less.

A cleaning composition for metal articles comprising:

• an amine (component A) represented by a general formula (I):
• wherein R1 and R2 each independently represent a hydrogen atom, an alkyl group having 1 or more and 6 or less carbon atoms, a phenyl group, a benzyl group, an aminoethyl group, a hydroxyethyl group, or a hydroxypropyl group and R3 represents a hydroxyethyl group or a hydroxypropyl group;
• a nonionic surfactant (component B) represented by
• a general formula (II):
• R4—O—{(EO)n1/(PO)m1}—H (II)
• wherein R4 represents an alkyl group having 12 or more and 16 or less carbon atoms, EO represents an ethyleneoxy group, PO represents a propyleneoxy group, n1 represents an average number of moles of EO added, m1 represents an average number of moles of PO added, n1 is a number of 2 or more and 20 or less, m1 is a number of 0 or more and 20 or less, and a form of the PO added and the EO added shown in { } is optionally a random arrangement or a block arrangement;
• a nitrogen-containing nonionic surfactant (component C) represented by a general formula (III):
• wherein R5 represents an alkyl group or a cycloalkyl group having 8 or more and 18 or less carbon atoms on average, BO represents an ethyleneoxy group, PO represents a propyleneoxy group, n2 represents an average number of moles of EO added, m2 represents an average number of moles of PO added, n2 is a number of 1 or more and 8 or less, m2 is a number of 0 or more and 8 or less, and a form of the PO added and the EO added shown in { } is optionally a random arrangement or a block arrangement;
• and
• water (component D),
• the cleaning composition having a pH of 7.1 or more,
• wherein a mass ratio of the component B to the component C (a mass of the component B/a mass of the component C) is 0.001 or more and 100 or less.