Summary for foam deposition on e-coat parts Discussion
Foam deposition on E-Coat/CED parts is the issue Ryan Doshi raised after seeing foam collect on flat horizontal surfaces coming out of the e-coat bath. He noted that the foam wipes off easily by hand or cloth, but that manual cleanup is not practical on the line. He also said the bath chemistry is within spec, though conductivity is a little high but still acceptable. In the excerpt provided, no expert replies or root-cause suggestions are shown, so the thread currently documents the problem rather than a confirmed fix. The key details are that the defect appears after the bath, is limited to horizontal surfaces, and seems tied to foam rather than cured coating failure. Because no answer text is included, there is no named advice to attribute beyond Ryan’s description of the issue.
Q. I am a new engineer at a paint line, and largely unfamiliar with troubleshooting problems (I have a background in Controls and Design). We are seeing foam deposition on flat horizontal surfaces after the E-Coat Bath. The foam is easily wiped by hand or cloth, but we have no way to integrate this into our line. The chemistry in the tank is all within spec, thought the conductivity is a tad high (still within bounds). I am unable to share images at this time. Any advice or suggestions would be appreciated.
Ryan Doshi
Manufacturing Engineer – Lafayette, IN
July 15, 2025