| 摘要 |
PROBLEM TO BE SOLVED: To provide an anticorrosion liquid for organic acid cleaning having anticorrosion and corrosion preventing effects during cleaning of a steel material, especially a chromium-containing steel material, and having these stable long-lasting effects during acid cleaning, and to provide a method of cleaning metals using the anticorrosion liquid for organic acid cleaning.SOLUTION: An anticorrosion liquid for organic acid cleaning is obtained by addition blending anticorrosion component to a cleaning liquid containing organic acid of 0 to 100 pts.wt., a chelator of 100 to 250 pts.wt. and a reductant of 50 to 150 pts.wt. and having pH of 6 to 8, and the anticorrosion component contains at least one kind of a pyridinium compound of 0.03 to 0.15 wt.%, an organic sulfur compound of 0.05 to 0.3 wt.%, and a soluble polymer having an ether group, a hydroxyl group, an ester group or a ketone group in a molecule of 0.03 to 0.2 wt.%. |
