| Autor: |
Rong Ji, Tow C. Chong, C.H. Seek, Thomas Liew |
| Rok vydání: |
2003 |
| Předmět: |
|
| Zdroj: |
Tribology International. 36:447-454 |
| ISSN: |
0301-679X |
| DOI: |
10.1016/s0301-679x(02)00233-5 |
| Popis: |
Heads and media used in extremely high recording density hard-disk drives are protected against corrosion and wear by an ultrathin diamond-like or amorphous carbon overcoat. However, corrosion will occur if the ultrathin protective overcoat is porous or defective due to poor film deposition or is damaged tribologically. Disk media with ultrathin carbon overcoat subjected to accelerated environment (humidity, temperature and corrosive gas) testing were found to corrode along texture lines and at random pinholes via galvanic corrosion. Similarly, head pole materials also corrode at pinholes and the corrosion products were found to distribute across the poles and beyond after. Heads and media subjected to contact-start-stop (CSS) testing were more susceptible to corrosion. Clusters of corrosion spots and overcoat flaking or fracture were observed on wear track of the disk media. Overcoat fracture and damage is even more severe for the recording heads. Chemical analysis and imaging of the corrosion products using the time-of-flight secondary ion mass spectrometer (TOF-SIMS) and Auger electron spectrometer (AES) showed that the corrosion products are various oxides and hydroxides and or chlorides (if Cl is present) of Co from the magnetic storage layer and of Ni from the NiP plating layer or Ni and Fe for the recording heads. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect