Posted by Gordon England on July 24, 2003 at 11:08:41:
In Reply to: Removal of Zinc Metal Spray from steel bridge. posted by Stephen Fry on July 23, 2003 at 17:00:03:
: We are having 'economic' dificulties in removing metal sprayed zinc from a steel bridge deck (30 years old).Currently we have to resort to locally disc grinding after a single pass with a motorised shot blast unit.
: Is there some 'benign' chemical cleaner or etchant that might reduce the adhesion properties to the steel substrate, thereby making removal easier.
: Thank you,
: Steve Fry
Hi Steve
Why are you removing zinc coating and what is to happen to the stripped surface?
Acid pickling or rust removing solutions should attack and degrade zinc coating. I remember using concentrated hydrochloric acid with antimony trioxide additions for analytically purposes, which was very effective and left steel substrate completely free of attack. These methods are usually dip processes conducted in controlled enviroments. I think in your environment chemical stripping will be a very messy process and may not be that effective. Also, there would be serious concerns with regard to health and safety and environmental issues.
I think grit blasting would be the best option, particularly if you are planning to re-coat.
Follow Ups:
Surface Engineering Forum
Surface Engineering Message Board Archive
Surface Engineering Message Board Archive Index
www.gordonengland.co.uk
Introducing
Nature of Thermal Spray Coatings
Surface Engineering in a Nutshell
Surface Engineering Forum
Thermal Spray Gun Repair Service
Plasma Consumable Parts
Thermal Spray Powder Supplies
Applications:
Thermal Spray Coatings on Carbon and Glass Fibre Reinforced Polymers
HVOF Coating of Paper Making Roll
Abradable Coatings
Thermal Spray Processes:
Combustion Wire Thermal Spray Process
Combustion Powder Thermal Spray Process
Arc Wire Thermal Spray Process
Plasma Thermal Spray Process
HVOF Thermal Spray Process
HVAF Thermal Spray Process
Detonation Thermal Spray Process
Plasma Flame Theory
Cold Spray Coating Process
Wear and Use of Thermal Spray Coatings
Corrosion and Use of Thermal Spray Coatings
Glossary of Thermal Spray and Surface Engineering Terms
Image Directory for Thermal Spray Coatings
Plasma Gas Flow Information
Plasma Gas Flow Correction Calculator
Contact Form
Links to other interesting sites related to thermal spray and surface engineering
Reciprocal Links
Periodic Table of the Elements
SI Units
Calculators for Conversion between Units of Measurement
Hardness Testing
Surface Engineering Message Board Archive
Surface Engineering Message Board Archive Index
Photography Gallery2
Photography Gallery3
© Copyright Gordon England