Iron-Phosphorus Pre-plating Solution and Pre-plating Method for Prevention of Bare Spot of Hot-Dip Aluminized Ferritic Stainless Steel Sheets

摘要

An Fe-P line-up solution and a line-up method for preventing non-plating of hot-dip aluminum-plated ferritic stainless steel sheets are provided. The present invention provides a Fe-P lead layer with an amount of 0.1 to 2.5 g/m2 on one side or both sides without strict management such as preheating, reducing atmosphere, etc., or separate surface activation and pickling processes on a ferritic stainless steel sheet. In addition, the Fe-P lead-gold layer improves the wettability of the ferritic stainless steel sheet and the molten aluminum, so that iron (Fe) is 5, which can effectively prevent the unplating of the hot-dip aluminum-plated ferritic stainless steel sheet. It contains phosphorus (P) in a concentration of ~250g/L and phosphorus (P) in a concentration of 0.1~5.0g/L, an antioxidant that prevents oxidation of iron ions, a stress reliever that improves plating adhesion, an ion adsorbent, and residual water (H ₂ O), and after washing to remove foreign substances on the surface of the ferritic stainless steel sheet, the Fe at a current density of 5 to 150 ASD, a temperature of 30 to 75°C, and a pH of 0.8 to 5.5. -P The present invention relates to a forward plating method, characterized in that, by immersing in a forward plating solution, an Fe-P wire layer is formed with an adhesion amount of 0.1 to 2.5 g/m2 on one side or both sides.