As a new type of anti-corrosion coating on metal surface, Dacromet is considered a replacement of electroplated zinc and thermally dip-coated zinc. The key lies in the preparation of the superfine flake-like Zn-Al powders. The dacromet with dimension of 10×10×0.1μm is manufactured by Hangda's unique technique ( China national patent: ZL021449678), which meets the international standard.
Hangda offers HDX320, HDX350 and HDX380 series Dacromet products.
Physical and chemical properties
Properties |
range of values |
pH |
3-5 |
Viscosity (4 cups) |
20-40 |
Density g/cm 2 at 25± 2 ℃ (77 o F) |
1.30-1.36 |
Dispersive degree 25± 22 ℃ (77 o F) |
After 4h, no obvious delamination, no sediment of metal powder. |
Corrosion properties
No. |
Thickness(μm) |
Quantity (mg/cm 2 ) |
Lifetime in neutral Salt spray (h) |
1 |
4 |
180 |
240 |
2 |
5 |
225 |
480 |
3 |
8 |
360 |
720 |
4 |
9 |
405 |
960 |
Other performance
No. |
Item |
Detailed description |
1 |
Fast corrosion test |
no red rust after 1.5h |
2 |
Adhesion strength
(tested by adhesive tape) |
No delamination; color change of adhesive tape and Zn-Al particle sticking are allowed |
3 |
heat-resistance (adhesion strength) ( 150 ℃ , 77 o F) |
After 3h treatment, there does not appear delamination , color change of adhesive tape and Zn-Al particle sticking are allowed |
4 |
Moisture and heat resistance |
After 240h, there is no red rust, froth or delamination |
Dacromet Coating Procedures:
Pre-treatment: surface cleaning → sandblast → dipping in solution→spin dryingCuring: pre-heating at 60~ 80 ℃ (140~176 o F) for 10min→ curing at 300 -320 ℃ (572-608 o F) for 20-30min →rapid cooling to room temperature
Photograph:
SEM micrographs of metal powders; certificate of granting of patent |
