Surface Prep and Precision Masking
Importance of Surface Prep & Precision Masking
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Cleanliness is the #1 factor affecting coating adhesion and performance. Any oil, soil, or residue can lead to coating failure.
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Precise masking provides the highest standard of coating consistency, allowing for tight tolerances and minimal rework.
Surface Cleaning Techniques
Precision Coating Preparation
Liquid Cleaning Methods
Purpose: Remove oils, soils, and contaminants.
Cleaning Solutions
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Use detergents or caustic cleaners depending on contamination level.
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Mild examples: Simple Green, 409
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Aggressive examples: Industrial caustic or acid-based cleaners (hazardous—use caution)
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Cleaning Process
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Spray cleaning followed by fresh water rinse
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Multi-stage tank systems for plating or painting lines:
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Soap wash
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Rinse
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(Optional) Diluted acid rinse
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Final fresh water rinse
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Maintenance
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Replace or filter cleaning/rinse solutions regularly.
NOTE: Dirty cleaning baths can re-deposit contaminants and cause coating defects.
Submersible Liquid Cleaning Station
Dry Cleaning / Mechanical Prep
Purpose: Remove light soils, oxidation, and provide mechanical adhesion.
Blasting Methods
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Aluminum oxide blasting is standard for thin-film ceramics.
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Cleans and creates a uniform, fine surface profile.
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Avoid overly rough textures that can break through thin coatings.
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Pre-Blast Cleaning
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Remove oils first (e.g., soak in brake cleaner) to prevent media contamination.
Post-Blast Cleaning
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Remove dust/particles via:
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Clean compressed air
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Tack cloth
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Post-clean dip (if required)
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Post-Blast Cleaning with Clean, Compressed Air
Precision Masking
For Advanced Coatings
Precision masking is an essential part of the majority of PVD, powder coating and thin-film ceramic coating processes. Masking is used to cover surfaces that do not require coating, and while different types of tape are often utilized, masking plugs are used to protect threaded areas and holes.
For example: many manufactured parts have areas like threads, mating surfaces, or electrical contact points that must remain free of coating to perform properly once assembled. Accurate masking prevents material buildup in these critical zones, avoids interference fits, and preserves precise tolerances.
In addition, proper masking helps to reduce rework, contamination issues, or the need for secondary machining.
Precision masking supports both the performance and the aesthetic quality of the final product—ensuring consistency, reliability, and adherence to engineering specifications.
Precision Masking Prior to Coating Parts
MASIC's Advanced Coating Processes Include
Masking Surfaces and Threaded Areas for Adherence to Specifications.
