Hongchang Technology Co., Ltd. is a company dedicated to the production and sales of stainless steel pickling passivation solutions.
Pickling and passivation of stainless steel should be mechanically cleaned and then degreased before pre-treatment of surface dirt. If pickling and passivation solution cannot remove grease, the quality of oil will affect the surface pickling passivation, so degreasing cannot be omitted and can be carried out by alkali, emulsifier, organic solvent and steam.
The pickling and passivation process controls the removal of free iron and other metal pollutants by the nitric acid solution is effective, but the removal of the oxide film, the thickness of the corrosion product film, and tempering are ineffective. Generally, HNO3+HF solution should be used. , For convenience and safe operation, fluoride can be used instead of HF. A single HNO3 solution without inhibitor, but HNO3+HF acid wash, requires addition of Lan-826. Use HNO3+HF pickling, in order to prevent corrosion, the concentration should be kept in a ratio of 5:1. The temperature should be lower than 49℃, if it is too high, HF will volatilize.