Surface Treatments & Finishes For Electronic & Mechanical Systems (AQA GCSE Design & Technology): Revision Note
Exam code: 8552
PCB lacquering
PCB lacquering applies a thin conformal coating over a completed circuit board
The clean, dry PCB is masked where necessary and sprayed, brushed or dipped before curing
Protects against moisture, dust, corrosion and some chemical contamination without preventing circuit operation
Worked Example
State one reason for applying pcb lacquering to a product.
[1 mark]
Answer
Protects against moisture, dust, corrosion and some chemical contamination without preventing circuit operation. [1]
Examiner Tips and Tricks
If asked to describe how PCB lacquering or lubrication is carried out, examiners want the physical process, not just the benefit. An answer that only states why a finish is used (e.g. "it reduces friction") scores zero on a 6-mark "describe how" question.
Instead you need to name the equipment and each stage: for PCB lacquering, masking, then spraying, brushing or dipping before curing; for lubrication, applying the correct lubricant at the specific moving part (bearing, gear or pivot) in the required amount.
Lubrication
Lubrication places oil, grease or another lubricant between moving mechanical surfaces
The correct lubricant is applied in the required amount at bearings, gears, pivots or sliding parts
Reduces friction, wear, noise and heat, helping systems operate efficiently and last longer
Unlock more, it's free!
Join the 100,000+ Students that ❤️ Save My Exams
the (exam) results speak for themselves:
Was this revision note helpful?
