Metal finishing Q&As since 1989

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Want Published Refs. to E-Nickel Salt Spray Performance

I need published information concerning salt spray performance for electroless nickel coatings on steel, especially data that will compare high-phosphorus and mid-phosphorus deposits at relatively low thicknesses (less than 0.5 mil). Are there any published texts or papers listing salt spray performance of electroless deposits at lower thicknesses?

Greg Dant
- Minneapolis, Minnesota USA
2001

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2001

Virtually everything that is published is self serving to the person that wrote it.

Generally speaking, High P is more corrosion resistant than Mid P. HOWEVER--At 0.5 thou, neither has great resistance. 1.5 is minimum if you are serious.

0.5 normally means 0.4-0.6 and sometimes 0.3-0.7. The one that is larger will win nearly every time since EN is a columnar deposit.

The operator has a huge influence also. The conditions of the tank will not be identical from one run to the next. The preprocess is rarely perfectly identical. The parent metal is rarely identical, sometimes in the same Lot#.

There are a few industries that control everything extremely tightly, but that is so expensive that it is limited to a very few. It just is not cost effective. James Watts
- Navarre, Florida