Industry · Metal and Surface Treatment
From electrolyte baths to rinse circuits, from acid lines to rolling water: filtration engineering that determines coating quality and bath life.
PVDF · PP
Housing material for aggressive acid baths
Pinhole
Typical surface defect caused by bath particles
Coalescer
Tramp oil separation solution
Critical points
In plating, anodizing and galvanizing, operational success is measured by the purity of the electrolyte baths and the particle load of the rinse circuits. Contamination in the bath comes straight back as surface defects; filtration breaks this chain at the source.
Electroplating and anodizing baths become contaminated over time with anode sludge and ambient dust. Microscopic particles that build up in the bath cause roughness, pinholes and darkening on the metal surface. Filtration removes these particles from the bath, protecting both surface quality and the bath’s active components; bath change intervals get longer and chemical and waste management costs fall. A clean electrolyte bath also lowers electrical resistance, so current reaches the part more evenly and the same coating thickness is achieved with less energy.
Solution: Continuous bath filtration
Surface treatment lines operate at very low or very high pH. Standard filter materials degrade quickly in these conditions; PVDF, polypropylene or specially coated housings should be used for aggressive acid baths. Metal particles and scale that clog spray nozzles in rinse lines are also filtered out to ensure parts are cleaned evenly.
Solution: Chemically resistant material selection
Oil left on the metal surface after rolling and forming prevents the coating from bonding to the metal and increases the risk of peeling. Tramp oil in process water and cleaning baths is removed with coalescer filters or skimmer systems, while metal chips are separated with magnetic or mechanical separators. A clean water circuit lowers chemical consumption and minimizes scrap rates.
Solution: Coalescers and magnetic separators
Plating line
Select a stage on your line to see the Prosestim filters and micron range used at that point.
01 · Tramp oil
Oil left on the surface after rolling prevents the coating from bonding; tramp oil in cleaning baths is removed with a coalescer or skimmer.
02 · pH 1–14
Standard materials degrade quickly at very low or high pH; polypropylene- and PVDF-based solutions are preferred.
03 · Anode sludge
Microscopic particles that build up in the bath cause roughness and pinhole defects; filtration extends bath life.
04 · Bath stability
A clean electrolyte lowers electrical resistance, so current reaches the part evenly.
05 · Spray nozzles
Metal particles and scale in rinse lines are filtered out to ensure parts are cleaned evenly.
Applications
The same filtration principles apply across applications, with different material and micron choices.
Bath circulation filtration.
Electrolyte purity and energy efficiency.
Chemically resistant filters and housings.
Nozzle protection and water savings.
Products used in this industry
Each product page lists the micron range, material compatibility and operating conditions.
Ultrasonically welded polypropylene felt bag filter, 1–200 µm, resistant to pH 1–14; for chemical, paint and water lines
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Multifilament polypropylene bag filter, 75–1500 µm, chemically compatible with pH 1–14; an economical solution for liquids containing acids and alkalis
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Process-specific three-layer SPS bag filters that filter viscous liquids containing acids and alkalis down to 0.5 µm
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String-wound cartridge filters in 8 media including PP, cotton and glass fiber, 0.8–150 µm, 5″–40″ lengths
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PCP bag filters with a PP outer layer and cotton core; filtration down to 0.5 µm for chemically demanding, oily liquids
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Bag filter housing with 1–24 bag capacity and AISI 304/316/316Ti body; high flow, low pressure drop
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