めっき技術

Light reflection

Light reflection functions are used to (1) totally reflect light like a mirror and (2) prevent glare for requirements of anti-glare properties. As for the anti-glare properties, while the most superficial layer is bright-plated, reflection is prevented by forming microscopic projections and depressions on the base surface or by forming projections and depressions by composite plating in which fine particles are co-deposited on the primary plating.
Type of plating Characteristic value Uses
(1) Specular reflection plating
[1] Bright nickel-chromium plating
[2] Bright nickel-gold plating
[3] Rhodium plating
- Silver > Gold > Copper > Aluminum ≒ Platinum ≒ Rhodium ≒ Chromium > Nickel
For details, see the illustration below.
Road safety convex mirrors, aluminum mirrors for building interior and exterior, copiers, reflecting telescopes
(2) Anti-glare plating
[1] Bright nickel-chromium plating
[2] Black chromium plating
- Metal bases are roughed by sandblasting or shotblasting.

- Projections and depressions are formed by co-depositing fine particles on the most superficial surface of plating.

- The principle of light absorption is used.
- Automotive safety standards (U.S., Canada, and Australia)
採用事例
Light reflection
Zinc-nickel alloy plating
(Trivalent black chromate treated)
hikarisub.jpg
Reflectivity of major metals (From “Mekki Gijutsu Manyuaru” edited by Tokuzo Kanbe, Japanese Standards Association)