finishing.com -- The Home Page of the Finishing Industry

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics

60,000 Q&A topics -- Education, Aloha, & Fun

topic 8885

Reducing time for salt spray testing


2001

Dear all,

As we noticed, salt spray test for Zinc phosphating can last for 100 hrs or more, which consumes lots of time, energy and resources. I'm currently handling a project to minimize/reduce this salt spraying time but give the same result. Posting this message and wish to hear the valuable idea from you,

Thanks!

p/s: Would like to hear if there is any completely new salt testing method for zinc plating

chee hong lee
Chee Hong, Lee
- Singapore


2001

I understand what you are trying to do. Many people have pursued this idea in the past. There are corrosion tests that have been developed in efforts to improve upon salt spray. You will want to also review specifications for the Kesternich test that uses sulfur dioxide, CASS test (ASTM B368 [affil. link to spec at Techstreet] ) that uses copper ions and acetic acid, cyclic tests such as GM9540P and SAE J2334 [affil. link to spec at Techstreet]. These are all different accelerated corrosion tests. (There is also a test from Japan called the "sandbox test" a.k.a. the "Swedish mud-bath test", but I have a personal bias against it because of lack of repeatability.)

The chemical reaction mechanism of corrosion occurs over years. An accelerated corrosion test proposes to do the same thing, but in a fraction of the time. A big problem is that the chemical reaction mechanism has been changed. The reaction that takes weeks is different from the one that takes years. Generally speaking, the shorter the corrosion test, the less accurate it is.

Most of these tests were developed with the idea of increasing accuracy, not reducing time. Auto manufacturers often rely on vehicle durability testing out at their proving ground that can take up to half a year. Even though it takes a lot of time and resources, it is a more accurate test. I would imagine any test faster than salt spray would have accuracy problems.

Another problem is establishing standards. The finishing industry has decades worth of salt spray experience. Most standards are based on salt spray hours and have been for some time. Any new test would need to be run quite a few times just to establish trust in how repeatable and accurate the results are. New test standards would also need to be developed.

You have quite a task ahead, and you may find that salt spray is the best test there is without sacrificing reliability. If you end up developing a new test, please share some of your results with us. I am sure the industry invites new test development. Good luck!

tim neveau
Tim Neveau
Rochester Hills, Michigan

finishing.com is possible thanks to our supporting advertisers, including this one:

CMLSbanner

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

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 Compliance


©1995-2020 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.