We present technical expertise that, through constant investment and development, has been able to meet the challenges of today‘s world.
We present technical expertise that, through constant investment and development, has been able to meet the challenges of today‘s world.
DSP uses advanced Physical Vapor Deposition (PVD) coating technology based on advanced high vacuum technology to produce elegant, beautiful colors and durable arc-ion plated stainless steel products. This surface treatment process allows for wear resistant coatings by 10 times stronger than normal stainless steel products and lasts longer than any other coloring process known to date. The DSP stainless steel products are characterized by their color and gloss which are semi-permanent and they are strong enough to withstand acid rain and contaminants. They have greater resistance to fire resistance and resistance against chemicals than any other exterior finish materials.
The hardness of the thin film of this product measured with the Micro Vickers tester is at least 10 times higher than that of stainless steel.
As a result of performing the peel test by scratching the product with a knife at an interval of 2 mm and putting cellophane tape on the surface, no film peeling was observed.
As a result of visual assessment by observation after a 1-kg steel ball dropped on the product from the height of 50 cm by using the DuPont impact tester, there was no damage or discoloration.
| Hardness (HV) | |
|---|---|
| Ion Plating | 2250 |
| Stainless(304) | 150~170 |
As a result of applying a load of 500g on an eraser by using a SUGA rotational abrasion tester on the surface with thickness of 0.5 micron for ion plating and wearing it down for 200 repetitive cycles, the color reaction of chemical compounds were exposed but ion-plated films were not peeled off.
As a result of visually observing the change in the color of the ion-plated material after being left for 500 hours at the temperature of 50°C and the humidity of 98%, no problem was found.
Below is the load at the moment that scratches start to appear from ion plating scratched at the speed of 150 mm/min by using the Clemens type scratch hardness tester. Ion plating has by 3 times higher scratch hardness than chemical plating.
| Scratch Hardness | |
|---|---|
| Ion Plating | 15.7N |
| Chemical Plating | 4.9N |
Artificial sweat liquid similar to human sweat (PH 4.5. JIS LO848) is prepared. Ion-plated frame is then submerged in at a room temperature for 8 hours. Afterwards, it‘s removed and left to dry in room temperature for 16 hours. The table shows the results obtained when this sequence is repeated 7 times. No corrosion of ion plating from artificial sweat occurred on the metal plate.
| Artificial sweat resistance | Evaluation | |
|---|---|---|
| Ion Plating | Gold | No abnormalities |
| Brass | No clear | Partial pitting corrosion confirmed |
| No clear | Corrosion in several parts confirmed | |
1. Gold - TiN / 2. Black - TiC / 3. Bronze - TiCN
| Coating layer | TiN (Titanium nitrlde) |
CrN (Chromium nitrlde) |
TiCN (Titanium Carbon nitrlde) |
TiAIN (Titanium aluminium nitrlde) |
TiC (Titanium carbide) |
|---|---|---|---|---|---|
| Hardness Hv(25g) | 2,200 | 2,000 | 3,000 | 3,500 | 3,700 |
| Friction coefficient | 0.6 | 0.5 | 0.45 | 0.7 | 0.7 |
| Coating thickness(㎛) | 0.1 - 5 | 0.1 - 5 | 0.1 - 5 | 0.1 - 5 | 0.1 - 5 |
| Coefficient of thermal expansion(10-6/K) | 9.4 | 12 | 7.4 | 5.5 | 7.7 |
| Oxidation temperature(℃) | 500 | 700 | 350 | 800 | 700 |
| Coating color | Gold yellow | Silver gray | Brown | Violet gray | Black |
