Fading & Refinishing Heat-colored Work in Industrial Areas
工业污染区热着色件的褪色与翻新
标签：工业污染, 酸雨, 褪色, 翻新, SO2
SO₂ 年沉积量高的工业区，酸雨会把热氧化干涉膜逐点转化为硫酸盐蚀斑：暖金/紫褐色面板通常 2–4 年出现云状褪色。翻新流程：中性清洗剂低压水洗 → 800–1200 目海绵磨块局部打磨褪斑（禁角磨机，磨穿干涉膜即不可逆）→ 烘箱或火焰整体补温至原色区间 → 封护升级为耐酸氟碳两道。预防要点是交付即涂防指纹油并纳入年度清洗合同，比 3 年后整体翻新节省约 60% 费用。
In industrial zones with high SO₂ deposition, acid rain converts heat-oxide interference films into sulfate blotches — warm gold/violet-brown panels typically cloud-fade in 2–4 years. Refinish by: low-pressure wash with neutral detergent; local abrading of faded spots with 800–1200 grit pads (no angle grinder — cutting through the film is irreversible); re-heating the whole panel in oven or flame back into the original color band; then upgrading to two coats of acid-resistant fluorocarbon. Applying fingerprint oil at handover plus an annual wash contract costs ~60% less than a full 3-year refinishing.