-- The Home Page of the Finishing Industry
Serious Education & the most FUN
you can have in metal finishing smiley

No popups, spam, registration or passwords
on this site
current topics
topic 8777

Carburetor Body Finish Improvement


We are in the business of manufacturing two wheeler carburetors in India. Presently we are working towards improving finish of our carburetor bodies (Zinc pressure Die cast) by way of passivation.

What should be the best pre-passivation, passivation and post passivation process to bring a silky smooth finish with a slight glow on our component. It should be able to pass 48-72 hrs salt spray test.

Kamal Wadhwa
auto components - Faridabad, Haryana, India


Dear Mr Wadhwa:

Zinc diecast carburetors can be passivated directly as possibly you are doing and their finish is to a point acceptable.

A second possibility is to plate the carburetor body with Alkaline Cyanide free zinc which is the preferred solution on account of its very high throwing and covering power . it covers the deepest recesses and passivates very well to provide a uniform Blue bright or a white finish that will last for anything from 48 to 96 hours salt spray.

I am reasonably sure platers in FBD who are aware of Alkaline cyanide free zinc will be able to give you the right answer. QC and Plating at Yamaha Faridabad too have plenty of inputs on the subject.


Asif Nurie
- New Delhi, India

With deep regret we
sadly advise that
Asif passed away

on Jan 24, 2016

If you have a question in mind which seems off topic, please Search the Site

ADD a Comment 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, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.