finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
topic 5973

Dying and Nickel Sealing Problems


(2000)

I have two small anodizing questions:

1. I'm using dyes from Clariant, mixed in tapwater w/o buffering and pH-adjustment. My colors are slightly lighter than those displayed in Clariant's color card. I use the same concentration. Any clue why?

2. I'm using a nickel salt to pre-seal after dying to keep the dye in the pores. Which is the lowest safe operation temp of this operation.

I hope someone can help me out I wolud be a great help!

Martin Dehlin
- Sweden


(2000)

Question #1

We haven't tried using the parameters you've stated but why don't you try the opposite- DI water, buffered, temp/pH adjusted. That works fine for us.

dado macapagal
anodizing - toronto, canada


(2000)

You have to adjust the pH and maintain the concentration of the dyes within their spec'ed range to get the appropriate color tones. Also, you can (as you stated) adjust the pH in the bath to get lighter tones, such as a pink tone from a red dye. Lower immersion times do this also, but, because of the lower times you have less dye immersed into the pores of the material, and when sealed some of the color will bleed away and the color will be lighter than you desired.

Matthew Stiltner
- Toledo, OH



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2018 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.