The authoritative public forum
  for Metal Finishing since 1989
-----

Nickel Chrome Plating Corrosion Resistance

We are unable to overcome the corrosion resistance time of 72 hrs. in salt spray testing as followed by the standard ASTM B117 duly after Nickel-Chrome plated automotive parts . We expect some comments on this issue how to make the plating flow of processes so that it could achieve at least 72 hrs. of salt spray test.

Arup De
- kolkata , West Bengl , India
2005

We expect more information to try to answer your questions. Without that, you quite simply are not maintaining ALL of your process parameters within normal limits, OR it would pass.

James Watts
- Navarre, Florida
2005

---

Is it possible to give us some more information about your process?

Regards,

Dominik Michalek
- Mexico City, Mexico
2005

---

2005

Hi with all respect for Mr. Watt write to you I will recommend you to look over all pretreatment steps and also all steps after nickel plating. I think you have iron in your nickel solution and bad rinse after that regarding pH and more.

Regards,

Anders Sundman
4th Generation Surface Engineering
Consultant - Arvika,
Sweden

---

Hi Anders,
Second thoughts, In many companies where plating is not the primary business, management knows very little of what goes on at the operator level, as in the actual maintenance of solutions and exact following of the process procedure. My current guess, since that is what we are doing, is they do not have enough nickel or chrome on the part. They did not tell us how much there was and how they measured it.

James Watts
- Navarre, Florida
2005

---

2005

James,
You have good point there.

Anders Sundman
4th Generation Surface Engineering
Consultant - Arvika,
Sweden

---

The ASTM standard that you quote specifically states that Neutral Salt Spray should not be used on Decorative Nickel/Chrome plating to evaluate corrosion resistance .

John Tenison - Woods
- Victoria Australia
2005

---

2005

Dear Mr. Arup,
We are also in automobile line, First of all you have to check the following things,
1) Type of component
2) Material used for substrate
3) Thickness which you are giving for Nickel
4) Impurities level of bath
5) sulfur level in you bath(i.e.Semi bright.bright)
6) RA value of component after buffing.

Vishwas Nangare
motorcycle accessories mfgr.
- Aurangabad, Maharashtra, India

---

2005

Dear Mr Arup De,

With the kind of BAD surface on your tongues, you need to vibro finish at-least for 24 hours before you send them out for plating. After that Tri-Nickel Chrome will see you through.

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

---

2005

Hello Mr. Arup de

Surely by this time you must have tried out a lot of things!
as our friends have expressed in the chat box, surely you need to tell us:

1. are you plating Duplex nickel or Triplex nickel

2. what is the substrate you are using - ABS or metal ( crca)

3. what thickness of nickel you are depositing?

4. have you got - STEP test equipment - this measures the potential between the substrate and the nickel layers.

Good luck!
Do respond if you need more specific trouble shooting..

CHANDRASHEKAR
- Bangalore, KARNATAKA, INDIA

adv.