| abstract |
The present invention provides a novel scale remover for a stainless steel weld zone and a scale removal method that can provide a high scale removal effect without using fluorine acid. SOLUTION: 3.5-10% by weight nitric acid, 10-20% by weight citric acid, 0.6-1.7% by weight chitosan, and 3.0-10% by weight amphoteric surfactant. The aqueous solution was used as a scale remover. The stainless steel weld was immersed in the scale remover, heated to 40-80 ° C., and the immersion time was 10-200 minutes. [Selection] Figure 1 |