Milline materjal sobib kõige paremini fluoriidi lagunemissaaduste vastu?

I. Eelistatud materjal südamiku sulami kontaktala jaoks (düüsid, torude vahetükid) Soovitatav materjal: Hastelloy C276 Eelised: kõrge molübdeeni + volframi suhe, selle korrosioonikindlus fluoriidi lagunemisproduktidele, nagu HF, on palju parem kui Inconel 625. Korrosioonikiirus 300 kraadi juures on<0.1mm/year, completely eliminating runner perforation, pitting corrosion, and adhesive leakage problems. Suitable scenarios: The optimal choice for the core melt area of ​​hot runners that directly contact high concentrations of fluoride decomposition products. II. Cost-effective selection for manifold runner bushings Recommended material: Inconel 625 alloy Advantages: Superior resistance to fluoride pitting corrosion compared to ordinary H13 steel, cost approximately 30% lower than C276, suitable for non-core runner areas with moderate concentrations of fluoride decomposition products. Suitable Scenarios: Melt runner bushings for hot runner manifolds, balancing corrosion resistance and cost control. III. Low-Cost Retrofitting of Ordinary H13 Steel Hot Runners Recommended Material: Hard chrome plating with a thickness ≥0.05mm Advantages: No need to replace the entire substrate; simply plate hard chrome onto the existing hot runner surface to effectively prevent fluorine decomposition products from contacting the H13 steel. The retrofitting cost is only 1/10 of replacing the entire alloy. Suitable Scenarios: Low-cost corrosion protection upgrade for existing hot runners, suitable for low to medium corrosion conditions. IV. Electrical Insulation and Sealing Selection Insulation Material: High-purity PFA insulated wire, offering 30% better resistance to fluorine corrosion compared to ordinary PTFE, suitable for thermocouple wire insulation in the high-temperature zone of hot runners. Sealing Material: Perfluoroether rubber sealing rings, with long-term temperature resistance up to 320℃, completely resistant to HF corrosion, used for sealing hot runner joints and temperature sensing holes to prevent decomposition products from overflowing and corroding surrounding components.