STUDIES OF ELECTROLESS NICKEL-BORON ALLOY COATINGS

被引：4

作者：

BEDINGFIELD, PB

LEWIS, DB

DATTA, PK

GRAY, JS

WELLS, PB

机构：

[1] SHEFFIELD CITY POLYTECH,MAT RES INST,SHEFFIELD S1 1WB,S YORKSHIRE,ENGLAND

[2] UNIV HULL,SCH CHEM,HULL HU6 7RX,N HUMBERSIDE,ENGLAND

来源：

TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING | 1992年 / 70卷

关键词：

D O I：

10.1080/00202967.1992.11870935

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Electroless nickel-boron coatings were deposited on mild steel substrates at various temperatures and pH values from a bath containing dimethylamineborane reducing agent. The bath was formulated to produce deposits with approximately 5% boron content. The thickness time data obtained revealed linear deposition kinetics showing dependence on temperature and pH. The coatings developed through a nucleation and growth type process were microcrystalline in nature and were highly supersaturated with respect to boron. Thermal annealing induced decomposition of this supersaturated solid solution. A peak hardness value of 1000 Hv was obtained after annealing at 300-degrees-C for 1 hr. Softening resulting from annealing at higher temperatures (450-600-degrees-C) was caused by particle coarsening, loss of coherency and ultimately by matrix annealing.

引用

页码：19 / 23

页数：5