How best to gold plate titanium and hastelloy substrates?

[klemke09]

Hello
I have a two part question, maybe this forum can help with some of these issues (I am trying to gold plate a suite of different materials that will be in contact with high temperature solutions).

First, I want to gold plate over a nickel plating on a titanium substrate. The gold plated surface will be in contact with a high temperature solution, over a period of a couple of days to a week max. Can this be done? Is Nickel the best suited material to be sandwiched between Titanium and a gold plated surface?

Second, I want to gold plate onto a hastelloy C-type alloy (that gold surface will also contact a high temperature solution up to 300degC and max. one week time period). What type of plating(s) is/are best suited to be sandwiched between the hastelloy C substrate and the top gold plated layer so that the gold plated surface is stable and does not "peel off" or become otherwise detached?

Thanks for any advice in advance
Kono

[NOL4154]

Hello Kono,
Interesting project.
1. First question:
I want to gold plate over a nickel plating on a titanium substrate.
The gold plated surface will be in contact with a high temperature
solution, over a period of a couple of days to a week max. Can this be
done? Is Nickel the best suited material to be sandwiched between
Titanium and a gold plated surface?

a. My question is high temperature?
b. Will the test be thermal cycle?
b. What type of solution acid & base?
c. Why titanium substrate.

2. Second question:
H A S T E L L O Y C-276 alloy is a n i c k e l-m o l y b d e n u m-
c h ro m i u m w rought alloy that is generally c o n s i d e red a versatile
corro s i o n-resistant alloy.

Again need the questions:

My question is high temperature?
b. Will the test be thermal cycle?
b. What type of solution acid & base?

The conditions I am asking is to characterize the plating types (copper, nickel, gold, etc...) for the exposed environment. Remember you need to consider the x, y, z expansion rates of the plating vs the base materials.
Get back to me and I will ask a Metalurgist friend on the base material
Hope to hear from you.
Nol4154
armando4154@hotmail.com