Root-cause Tree for Blotches & Runs in Sulfide Coloring
硫化着色色斑与流挂根因树
标签：色斑, 流挂, 根因分析, 缺陷诊断, 硫化
缺陷排查建议按"前处理→槽液→操作→后处理"四层根因树逐级定位。云状色斑：多为脱脂不净或残酸未中和，以白纸巾擦拭压出油痕即可确认；点状浅斑：水中氯离子或铁锈微粒，末道改去离子水可除；竖向流挂痕：垂直出槽速度超过 0.3 m/s 或槽液未搅动，出槽放慢至 5–10 s 并斜 15° 提拉；指印状黑晕：汗手触碰半干面所致，须全程戴氯丁手套。每类缺陷记录位置与批次，累计 20 例后即可回归出本车间的高发因素排序，形成针对性点检表。
Diagnose through a four-level tree: prep → bath → handling → after-treatment. Cloudy blotches: poor degreasing or unneutralized acid — wipe with white tissue to reveal oil prints. Pinprick pale spots: chloride or rust particles in water — switch the final rinse to deionized. Vertical run marks: pull-out over 0.3 m/s or an unstirred bath — slow withdrawal to 5–10 s at a 15° tilt. Fingerprint halos: sweaty hands on the half-dry surface — neoprene gloves throughout. Log position and batch per defect; after 20 cases a regression ranks your shop's dominant causes into a targeted checklist.