Effect of Ternary Complex System on Low Phosphorus Composite Electroless Nickel - Phosphorus - Nano - Titania
The low phosphorus composite electroless nickel layer has excellent alkali corrosion resistance and ultra - high hardness, but it has not been applied to large - scale production. Based on the evaluation indexes of deposition rate, phosphorus content, hardness and porosity of the coating, and on the...
Saved in:
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Materials Protection
2021-10-01
|
| Series: | Cailiao Baohu |
| Subjects: | |
| Online Access: | http://www.mat-pro.com/fileup/1001-1560/PDF/20211012.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The low phosphorus composite electroless nickel layer has excellent alkali corrosion resistance and ultra - high hardness, but it has not been applied to large - scale production. Based on the evaluation indexes of deposition rate, phosphorus content, hardness and porosity of the coating, and on the basis of lactic acid - propionic acid binary complexing agent, the influences of triethanolamine, malic acid, succinic acid, and ethylenediamine as auxiliary complexing agents on the low phosphorus composite electroless nickel - phosphorus - nano - titania were studied. The basic formula and process conditions of the plating solution were: 23 g/L NaH2PO2·H2O, 28 g/L NiSO4·6H2O, appropriate amount of auxiliary complexing agent, 18 mL/L lactic acid, 4 mL/L propionic acid, 15 g/L CH3COONa·3H2O, 40 mg/L sodium dodecylbenzene sulfonate (SDBS), pH value 4.8±0.2, temperature (85±2) ℃ and 1 h of plating time. Results showed that when ethylenediamine was used as the auxiliary complexing agent, the overall performance of the coating was excellent. When the amount of ethylenediamine was 4 mL/L and the plating speed was 23.62 μm/h, the as - obtained coating had 3.53% of phosphorus content, 561.4 HV of the plating hardness and 0.35 pieces/cm2 of porosity. |
|---|---|
| ISSN: | 1001-1560 |