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Professional Service Industries, Inc
Pittsburgh Testing Laboratory Division
Tested
For:
Consolidation Coal Company
Maintenance Engineering
200 Hidden Valley Road
McMurray, PA 15317
Project: 831-13655
Attention: Tom Hinock
Date: 12-31-1991
PA Certified ID No. 02-349
Remarks: Client Ref. P.O.# 01-530-10211-00
Laboratory No.: INO13071
Sample
Description:
Twenty Two (22) Pieces of Metal
Submitted By: Client
Service Requested: Salt Spray Cass Test
Method of Test: ASTM B-368
Twenty
Two (22) pieces of metal were submitted by the client for
168 hours exposure to Cass Test (Copper Accelerated Acetic
Acid - 5% Slat Spray) per ASTM 8-368.
All observations and sample removal was performed by client.
Submitted By:
Professional Service Industries, Inc
Pittsburgh Testing Laboratory Division
Analytical Services
Joyce Walter, Division Manager
Microscopic
examination, Salt Spray Cass Testing, and bend testing were
performed on 22 plating samples provided by a number of vendors.
The samples provided by these vendors varied considerably
and differed as follow:
-
Single layer chrome
-
Two part chrome
-
Hard chrome and soft chrome
-
Chrome over nickel
-
Chrome over bronze
-
Nickel
-
Plating over induction-hardened rods
-
Different methods of applying the plating
Results
indicate the only acceptable plating is chrome over nickel.
Nickel seals off the underlying steel to prevent corrosion,
and the chrome will provide the hardness to prevent wear and
resist physical damage. Based on this testing, it is suggested
a plating spec as follows be considered:
- .003"
to .005" Nickel over Base Steel
- l.003"
to .005" Hard Chrome over Nickel
CORROSION RATING VISUAL SCALESALT SPRAY CASS TEST
Observations
of all plating samples were made daily during the Salt Spray
CASS Testing and assigned a relative number based on the amount
of red rust coverage:Rating Number Description
-
No rust or discoloration
-
Slight discoloration
-
Less than 1% rust
- 1
to 5% rust
-
5 to 10% rust
-
10 to 25% rust
-
25 to 50% rust
-
50 to 75% rust
-
75 to 99% rust
-
100% rust
| Huntington
Plating Samples |
| Samples |
Reported
Spec |
Measured
Thickness/Side |
| No.
965D |
.0115"
Chrome over Nickel
.010" Nickel - First Layer
.0015" Chrome -Second Layer |
.0054"
Nickel
.0006" Chrome |
| No.
965Q |
.007"
Chrome
.0035" - First Layer
.0035" - Second Layer
Polished Between Layers |
.0045" |
| No.
965R |
.003"
Chrome over Nickel
.0015" Nickel - First Layer
.0015" Chrome -Second Layer |
.00075"
Nickel
.00075" Chrome |
| No.
965V |
.0065"
Chrome over Nickel
.005" Nickel - First Layer
.0015" Chrome -Second Layer |
.0039"
Nickel
.0006" Chrome |
Bend
Test Results
No. 965D-
Passed
No. 965Q- Passed
No. 965R- Passed
No. 965V- Passed
| CASS
Fog Test Results- Test Date: 12/03/91 - 12/12/91 |
| Sample |
Hours |
Final
Result |
| 6 |
25 |
49 |
74 |
81 |
105 |
129 |
153 |
| 965D |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
No
rust. A few small pits in chrome present. |
| 965Q |
7 |
8 |
8 |
10R* |
- |
- |
- |
- |
Small
pits to base metal present. |
| 965R |
1 |
2 |
2 |
2 |
2 |
3 |
6 |
7 |
Small
pits to base metal present. |
| 965V |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
No
rust. A few small pits in chrome present. |
| R*-Removed
from test chamber |
| TEST
RESULTS FOR- CHROME OVER BRONZE |
| Sample |
Reported
Spec |
Measured
Thickness/Side |
| No.
964X |
Chrome
over bronze
No thickness reported |
.0033"
Bronze
.0006" Chrome |
Bend
Test Results
No. 964X-
Passed
| CASS
Fog Test Results- Test Date: 12/03/91 - 12/12/91 |
| Sample |
Hours |
Final
Result |
| 6 |
25 |
49 |
74 |
81 |
105 |
129 |
153 |
| 964X |
1 |
4 |
4 |
5 |
5 |
7 |
9R* |
- |
Chrome
pitted or flaked off bronze underlay. Also pitted to
base metal. |
| R*-Removed
from test chamber |
|
