Molds & Tooling
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PVDF Corrosion of Barrel and Screw and Material Selection
Problem Phenomenon
【Problem phenomenon】After an ordinary nitrided steel barrel processes PVDF for several months, the inner wall corrodes, the gap enlarges, metering fluctuates, and product defects increase
Cause Analysis
The trace HF released during PVDF processing corrodes nitrided steel barrels and screws over the long term, and brass and copper alloy parts corrode even faster; ZetarMold explicitly requires bimetallic or Hastelloy barrels and prohibits copper alloy parts
Solution
New lines are directly equipped with bimetallic or Hastelloy-lined barrels and screws; brass and beryllium copper parts are prohibited in the melt channel; old equipment regularly measures the gap to evaluate the degree of corrosion, and corrosion-resistant parts are replaced immediately when out of tolerance
Key Takeaway
HF corrosion is a chronic killer; PVDF production lines must be equipped with corrosion-resistant barrels and prohibit copper parts; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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