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案例 · 沿海 · 316L · 点蚀 · 酸洗钝化

案例复盘:沿海幕墙 316L 点蚀排查与整改(匿名)

某沿海项目幕墙立柱使用 316L 两年后出现点蚀。根因是表面残铁污染 + 缝隙结构 + 高氯环境;整改为酸洗钝化 + 结构排水 + 定期清洗。
以下为匿名案例复盘,供同类项目参考(非具体客户信息)。
背景:沿海地区建筑幕墙立柱,材料 316L,使用约两年后局部出现锈点与点蚀。
排查过程:
1) 现场:锈点集中在立柱底部与垫片接触处,属缝隙与积尘部位; 2) 检测:蓝点试验阳性,说明表面存在游离铁污染; 3) 分析:安装阶段切割、焊接后未彻底酸洗钝化,加上沿海高氯环境与缝隙结构,形成点蚀与缝隙腐蚀。
根因:残留铁污染 + 缝隙积水 + 高氯环境三者叠加,材料本身不是主因(316L 在该环境是合理选择)。
整改措施:
• 全面酸洗钝化,去除游离铁与氧化皮; • 改进节点设计:增加排水、避免垫片下积水、减少缝隙; • 定期清洗(尤其沿海盐雾沉积); • 对已出现点蚀的部位进行打磨修补并重新钝化,严重部位更换。
经验总结:不锈钢在沿海环境"选对材料"只是第一步,表面处理与结构排水同样决定寿命;验收时应要求酸洗钝化记录并做蓝点试验。
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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