Comparison between paint applied after silane treatment and paint applied after phosphating on valve surfaces?

Comparison between Silane Surface Treatment and Phosphating Techniques Comparison between Silane Surface Treatment and Phosphating Techniques I. Brief Introduction to Silane Treatment Technology Silane treatment technology is a new nanoscale metal pretreatment method that contains no harmful metals, and it provides excellent corrosion resistance for a wide range of multi-metal substrates. Silane treatment replaces traditional iron-based and zinc-based phosphating products and is environmentally friendly. The silane treatment product catalog offers a variety of products for metal surface treatment, such as cold-rolled steel, aluminum, galvanized steel, as well as applications for other multi-metal substrates. Silane treatment technology is gradually replacing pre-treatment processes in applicable industries. Silane-treated products are easy to use and offer excellent environmental benefits: they contain no toxic components, making them very safe to use. Therefore, the amount of wastewater generated during painting processes is minimized, and it is easy to treat. II. Chemical principles of silane treatment: This product is based on polymers with silicone functional groups, which enable it to meet the requirements for corrosion protection and improved adhesion of coatings. During the drying of silanes, adjacent hydroxyl groups react with each other, forming a dense film on the surface of the substrate that has an interpenetrating, network-like structure. After the metal surface is cleaned, the silane product can react with the hydroxides in its oxide layer at room temperature to form strong covalent bonds. III. Applications of silane treatment: General Industry, Automotive Industry, Automotive Components Industry, Coil Applications; Special Industries. IV. Process flow for silane-treated products: Silane treatment – E-coat process/SILANE-powder paint process: Electrophoresis using SILANE technology/Powder coating using SILANE technology: Pure water washing, Electrophoresis, Dw-015 phosphorus-free degreasing, Washing, Pure water washing, Silane treatment (DW-029), Pure water washing, Drying, Powder coating. V. Cost savings from silane treatment: Since silane treatment can be carried out at room temperature, there is no need to heat the bath solution. Moreover, the process for this project does not involve phosphates, so costs related to wastewater treatment are also reduced. Fewer production steps and shorter processing times help increase the factory’s capacity. The concentration of the bath solution can be controlled by the pH value, and measured using titration and spectrophotometry. In practice, there is almost no slag, as this process does not cause any significant erosion of the metal surface. VI. Comparison between Silane Treatment Technology and Traditional Zinc-Based Phosphating Techniques: Comparison of Silane Surface Treatment and Phosphating Technologies. Zinc-based phosphating; Silane treatment. Number of processing stages (degreasing/washing): 3 to 6; 2. Energy consumption: Tank heating – High; No heating required. Energy consumption for pumps: High; Low. Filtration systems, etc.: Yes; Compressors/conveyor belt filters: Yes; No. Disposal of phosphating residues: Yes; No. Pre-phosphating surface preparation tank: Yes; No. Passivation step: Yes; No. Post-phosphating tank curing time: 2 to 4; 0 to 2. Manual or chemical cleaning of tanks, pipes, nozzles, etc.: High; Low. Water/pure water consumption: High; Very low (closed-loop system). Water cost: High; Very low (closed-loop system). Treatment of wastewater containing heavy metals (e.g., nickel): Yes; No. Reaction time: 1.5 to 3 minutes; 1–120 seconds (even shorter)

May I ask if you have any specific experience in applying this? Such as adhesion and corrosion resistance.

No, the information is summarized from relevant materials.

The phosphating process is primarily problematic in terms of wastewater, waste residues, and heavy metals; it does not meet the current environmental standards. However, when combined with subsequent membrane technologies, it performs better than ceramic membranes based on silane structures. The latter are more environmentally friendly. Nowadays, there are also purely inorganic nanoscopic ceramic membranes that require only two processing steps