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-----Corrosion problem with nickel-chrome plated bumpers
April 29, 2009
We are a company that chrome plate truck bumpers and the following problem just came to us:
We have 5 bumpers with guarantee claim for red corrosion presence. The specification for these bumpers is 66 hr in CASS and a minimum of 37 microns of nickel.
Here is a table of the thicknesses of the corroded bumpers.
Thickness |
|
|
| Bumper 1 | Bumper 2 |
Semi-Bright nickel | 23.53 micron | 48.70 micron |
High Sulfur nickel | 2.50 | 3.00 |
Bright nickel | 7.05 | 19.00 |
Semi-Bright nickel | 8.32 |
|
High Sulfur nickel | 2.00 |
|
Bright nickel | 6.10 |
|
Semi-Bright nickel | 4.30 |
|
High Sulfur nickel | 2.00 |
|
Bright nickel | 4.81 |
|
Semi-Bright nickel | 1.0 |
|
Bright nickel | 2.03 |
|
Microporus nickel | 1.00 | 1.00 |
Chromium | 0.25 | 0.25 |
TOTAL NICKEL | 64.70 | 71.70 |
Because the appearance my client needs that some of the bumpers were re-processed some times to eliminate any damage in the finish. The re-process consist in: after plated if the bumper have anything that needs to be eliminated, we buff the entire bumper a little bit and deposit all the nickels and chrome again, this generate several layers of Ni over Ni.
We run CASS test of one of this bumpers and it passed the 66 hrs.
Does someone know why these bumpers were corroded? They only have been in the street for some months; all the guarantee claims came from the same region in Montreal.
Francisco HornelasManager of a plating factory - Mexico, Estado de Mexico, Mexico
DEAR FRANCISCO,
TRY ELECTROLESS NICKEL AT LEAST 15 MICRONS PRIOR TO SEMI- BRIGHT NICKEL
- RAJKOT, GUJARAT, INDIA
May 5, 2009
My dear friend:
Prior to give you any suggestion we need to know your Step test results between Semi Bright and High Sulfur, High Sulfur and Bright, and Bright and Microporous. And the microporosity.
- Guadalajara, Mexico
May 19, 2009
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