Acidic cleaning solution for aluminum-based metal materials

Abstract

The objective of this invention is to provide an acidic cleaning solution for aluminum-based metal materials that can achieve better cleaning performance while suppressing foaming. One embodiment for solving the above objective is an acidic cleaning solution for aluminum-based metal materials, comprising: 0.01 g / L to 25 g / L of at least one inorganic acid selected from the group consisting of sulfuric acid, nitric acid, nitrous acid, and phosphoric acid; 0.05 g / L to 4.0 g / L of ferric ions; and 0.1 g / L to 10 g / L of a surfactant; wherein the aforementioned surfactant comprises: surfactant A: a polyoxyalkylene ether with a cloud point of 80°C or higher; surfactant B: a polyoxyalkylene ether with a cloud point of 50°C or higher and 60°C or lower; and surfactant C: a polyoxyalkylene ether with a cloud point of 40°C or lower; wherein the cloud point is determined according to JIS K 3211:1990.