finishing.com -- 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
HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
topic 60875

Why do nails in Kanchan arsenic filters sometimes NOT rust?

60875-1ext
October 19, 2018

Q. Hello,

I was recently observing some Kanchan arsenic filters in Nepal (these are arsenic-removing water filters which rely on rusty nails as a source of ferric oxide). We came across a number of filters where the nails were not rusting. This is a mystery.

The nails have water poured over them, then are exposed to air, several times a day. The nails I observed had been in place for about 7 months, with multiple exposures to water and air every day over that time. We have tested the nails back home, and they rust quickly (as expected) under the same conditions using our tap water. Filters from neighbouring households using the same nails, but which drew water from different wells, were rusting fine.

What might be the cause of these nails not rusting in these homes?

Candice Young-Rojanschi
Researcher/ Troubleshooter - Calgary, AB, Canada



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