Sealing & Color
Sealing that finishes the coating, and the natural color of each alloy.
Sealing & Color
Sealing is the final step that closes the micropores of the anodic coating to complete its corrosion resistance. EF Technology applies low-temperature sealing and verifies it with the KS D 8315 sealing test. Undyed natural color is standard, and black dyeing is available. Under the same process, 6061 and 5052 turn out bright silver-gray, 7075 a yellowish silver-gray and ADC12 a gray base with a reddish-brown tone, so the color standard is agreed using limit samples.
Aluminum
SealingLow-temperature sealing
Standard colorNatural color
Color variationAlloy · coating thickness
Sealing testKS D 8315 sealing test
Natural Color by Alloy (typical after anodizing)
6061 · 6063Mg-Si alloy. Bright silver-gray with the most uniform color. Hard coatings range from gray to gray-brown.
5052Mg alloy. Bright silver with good gloss in soft anodizing; widely used for sheet.
7075Zn-Mg-Cu alloy. Yellowish silver-gray; hard coatings are dark gray-brown. Intermetallic compounds can cause staining, so material lots are also controlled.
2024Cu alloy. Yellowish gray; Cu makes the coating less uniform and lowers hard coating hardness. Criteria are agreed in advance.
ADC12 and other die-cast alloysA gray base mixed with a reddish-brown tone. Si produces the gray base, and Cu and Fe the reddish tint. Areas with concentrated alloying elements look darker or redder.
Specifications
Sealing methodLow-temperature sealing (sealing solution analyzed regularly)
Sealing testKS D 8315 sealing test
Color standardPer customer drawing and limit samples
Contact us even if the specification you need is not listed.Sealing & Color technical notes
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