| 摘要 |
PROBLEM TO BE SOLVED: To provide a discoloration preventive agent for alloys used for cleaning optical parts, electronic parts, metallic parts or ceramic parts mounted with parts made of an alloy or the simple substance of the parts made of an alloy or water rinsing therefor, further to provide an aqueous cleaning agent and a rinsing agent containing the same discoloration preventive agent, moreover to provide a cleaning method for alloys using the same aqueous cleaning agent and to provide a water rinsing method using the same rinsing agent. SOLUTION: This discoloration preventive for alloys is composed of at least one carbonate expressed by the general formula (1): MaHb(CO3)n (wherein, (a) is an integer of 1 or 2; (b) is an integer of 0 to 2; (n) is a metallic atom or a volatile organic base having ionization tendency higher than that of magnesium; and H is hydrogen) and at least one kind of nitrogen-based heterocyclic compound, and the weight ratio of the carbonate/the nitrogen-based heterocyclic compound is 0.001 to 10,000.
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