Bath concentration or pH drift
- Likely causes
- Raw-material variation, incorrect feed, drag-out or evaporation
- First checks
- Compare incoming specification, bath analysis, feed and volume records
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Products & Solutions · 07
Basic chemicals
Sulfuric, hydrochloric and nitric acids, caustic soda and other line chemicals are managed by specification, concentration, replenishment and lot.
PROCESS OVERVIEW
Product review starts with process conditions
Basic chemicals serve cleaning, pickling, etching, bath make-up, replenishment and conversion treatment. Raw-material specification is distinguished from actual bath concentration, with storage, handling and lot history controlled.
Suitability is reviewed with the substrate, upstream and downstream stages, control items, and required finish—not by product name alone.
- Applicable substrates & targets
- Sulfuric acid · Hydrochloric acid · Nitric acid · Caustic soda · Acid and alkaline raw materials for finishing
- Application scope
- Cleaning and degreasing · Pickling and activation · Aluminum etch and desmut · Bath make-up and replenishment · Conversion coating · pH adjustment
CONTROL POINTS
Key control items to review before application
Current settings and recent changes help establish a more useful inspection sequence.
- 01Raw-material grade, purity and concentration
- 02Incoming lot and certificate
- 03Actual bath concentration and pH
- 04Replenishment and analysis history
- 05Impurity and contamination risk
- 06Compatible storage and transfer materials
- 07Labeling, handling and safety documents
TROUBLESHOOTING
Common issues and first checks
One symptom can involve several process factors, so likely causes and the inspection sequence are reviewed together.
Smut or residue
- Likely causes
- Impurity buildup or acid/alkali condition mismatched to substrate
- First checks
- Compare raw-material lot, bath contamination and substrate response
Adhesion or corrosion variation
- Likely causes
- Pretreatment concentration, rinse carry-over or raw-material contamination
- First checks
- Trace raw-material, replenishment and rinse history of affected lots
TECHNICAL SUPPORT
PLACHEM support scope
Field conditions and defect symptoms are used to organize the items that should be checked first.
- 01Raw-material specification and process-use confirmation
- 02Concentration, pH, replenishment and analysis criteria
- 03Lot, incoming, storage and usage trace support
- 04Review of links between process variation and raw-material factors
Discuss application conditions for Basic chemicals
Share the substrate, process sequence, chemicals in use, control values, defect symptoms, or required documents.