Black Stripe on Cold Rolled Coils: Important Issue

Summary for black stripe on cold rolled coils Discussion

Black stripe on cleaned and annealed cold rolled coils is the issue raised in this thread, where the poster reports a black surface appearing on cold rolled strip after electrolytic cleaning followed by annealing. The excerpt provided does not include any diagnostic replies, root-cause analysis, or corrective recommendations, so the page as shown mainly documents the problem statement rather than a resolved answer. The only named source in the excerpt is Ted Mooney, P.E., who appears in the site header, but no technical guidance from him is included in the visible text. Based on the available content, the thread centers on an unexpected black stripe or black surface defect developing during the cleaning-and-annealing sequence and seeks quick confidential help to identify why it is happening.