NiP Composite Coating of Piston Ring by Plate and Bumper Method
405
Table 4 Potentiostat measurement of NiP/SiC (5, 50, 100 gm/lt) in 0.5 M solution of Na 2 SO 4 of
heat-treated and non-heat-treated piston rings
Description of
the piston rings
E Corr (mv) I Corr (µ A) Beta (A) (mv) Beta (C) (mv) Corrosion rate
(mmpy)
Chrome plated −636.451
0.073
60.3
82.3
0.8595
NiP medium P
(100 g/lt SiC)
without HT
−600.650
33.850
33.4
33.1
1.32693
NiP medium P
(100 g/lt SiC)
after HT
−423.562
25.068
58.6
10.1
0.98267
NiP medium P
(50 g/lt SiC)
without HT
−454.499
11.915
51.5
20.2
0.46707
NiP medium P
(50 g/lt SiC)
after HT
−487.573
59.783
68.7
8.7
2.3435
NiP medium P
(5 g/lt SiC)
without HT
−395.556
37.997
62.6
10.9
1.48949
NiP medium P
(5 g/lt SiC)
after HT
−396.496
8.512
44.6
20.7
0.333672
Fig. 9 TR10 LE model pin on disc wear testera