Electroless Nickel
The characteristics of this type of coating include high hardness and wear resistance, and the thickness of the coating on irregularly shaped parts is uniform. This type of electroplating is most commonly used for electronic components to meet the needs of product use;
The thickness is divided into five grades according to ASTM B733:
- SC 0 Very slight wear environment use： 1 ~ 5μm
- SC 1 Lightly worn environment use： 5〜13μm
- SC 2 slightly abrasion environment use： 13〜25μm
- SC 3 Moderate wear environment use： 25〜75μm
- SC 4 Severe wear environment use： 75μm
RoHs Restriction of Hazardous Substance
The six chemical substances restricted for electronic and electrical products include:
- Lead (Pb)
- Cadmium (Cd)
- Mercury (Hg)
- Hexavalent chromium (Cr6+)
- Polybrominated biphenyls (PBB)
- Polybrominated biphenyl ethers (PBDE)
Introduction
The RoHS directive is accompanied by the same announcement of the WEEE (Waste Electrical and Electronic Equipment Directive), which mainly regulates the use of six chemical substances in WEEE products heavy metals-Lead，Cadmium，Hexavalent Chromium(Cr6+)，Mercury，Brominated flame retardants-PBB and PBDE . The components of electrical and electronic products that may be affected are shown in the table below.
RoHS Restriction of Hazardous Substance limited
|
Restricted materials |
Pb |
Cd |
Cr6+ |
Hg |
PBB、PBDE |
|
Limit |
1000 ppm | 100 ppm | 1000 ppm | 1000 ppm | 1000 ppm |