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水处理 · 海水淡化 · 2205 · 2507 · 缝隙腐蚀

水处理与海水淡化用不锈钢:2205/2507 与缝隙腐蚀

海水环境氯离子高,304 基本不适用;2205 用于一般海水系统,2507 适合更苛刻的膜法与高压段。
水处理与海水淡化的腐蚀环境特点:高氯、含氧、常有缝隙与沉积物,易发生点蚀与缝隙腐蚀。
选材建议:
• 一般淡水/污水:304/316L 视氯离子与温度评估; • 海水系统(冷却、预处理、低压段):2205 双相钢常用; • 高压段、膜法(RO)关键部位、缝隙严重处:2507 或 6% Mo 超级奥氏体; • 避免用 304 直接接触海水。
设计与工艺要点:
1) 结构避免缝隙与积水,法兰垫片选型要匹配; 2) 焊后酸洗钝化,控制热影响区; 3) 阴极保护/涂层与不锈钢组合要评估氢脆与电偶; 4) 定期清洗(防生物附着与沉积物)。
采购提醒:海水项目常要求第三方腐蚀试验与材料证书;2205/2507 的焊接需工艺评定与铁素体控制。
Compiled by SteelWe editors and industry experts. For industry exchange only; not trading or investment advice. Cite the source when quoting.
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