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钝化 · 蓝点试验 · 盐雾 · ASTM A967 · 检验

不锈钢钝化质量怎么检验:蓝点、盐雾与 ASTM A967

蓝点试验查游离铁、盐雾试验看耐蚀、按 ASTM A967 控制工艺参数。钝化后验收要留记录与试样。
钝化(passivation)质量直接影响不锈钢耐蚀性,常用检验方法:
1) 蓝点试验(ferroxyl / blue-dot):检测表面游离铁污染,出现蓝点为不合格;适合现场快速筛查。 2) 盐雾试验(NSS/AASS):按 ASTM B117 或客户规范,评估耐蚀等级;周期长,多用于型式检验或争议判定。 3) 硫酸铜试验:检测钝化膜完整性(部分标准引用)。 4) 表面检查:目视无氧化色、无残酸、无污染;必要时测表面粗糙度。
工艺控制(ASTM A967):
• 硝酸或柠檬酸路线,浓度/温度/时间按标准与供方工艺卡; • 前处理必须除油、除锈、除游离铁; • 钝化后充分漂洗,避免残酸; • 记录批次、槽液参数与检验结果。
采购建议:要求供方提供钝化工艺说明与检验记录;关键件做蓝点试验抽检;不要把"清洗"当"钝化"验收。
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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