-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 10292

Preventing corrosion by deionised water


I saw information in a corrosion engineering book that tin is the best material for a container or piping for very pure distilled water. I have also read that deionised (or deionized) water is water that has been through reverse osmosis and that although the way distilled water and deionised water is prepared is different, their properties are very similar.

Could something relatively cheap like tinfoil be used as an effective retardent for deionised water corrosion? Effective meaning months of protection.

rob connor
Robert Connor
- St. Catharines, Ontario, Canada


Mr. Connor:

Tin is indeed very good for corrosion protection. Not so long ago it was an effective mean, alone or coated with organics, to protect steel cans and containers for food and beverages. But there are other metals and alloys that are as good or better. Only problem is that depending on use, they might be too expensive (nickel and especially its alloy with phosphorous called electroless nickel in layers of 0.001" resist DW for several years not months). If, on the other hand, your DW contains high chlorides due to its manufacturing, tin will NOT last.


Guillermo Marrufo
Monterrey, NL, Mexico


I would have to agree. Tin is probably the best and least expensive metal up against distilled/deionized water--it is practically insoluble in water and it is fairly inexpensive.

Other metals are suitable, especially if attention is given to make sure the welds are protected. Glass is also very suitable if you make certain the water is degassed after distilling/deionizing. If there is no mechanical flex or abrasion involved, teflon is probably suitable as well.

By the way, reverse osmosis is technically not deionizing. The DI process usually involves distillation, followed by a treatment with mixed bed deionizing resins, followed by charcoal and mechanical filtration. From there, it just depends on how pure you need the water to be. Water readily absorbs gases from the air and is a potent solvent (ultrapure water will dissolve glass, quartz, sapphire, all stainless steels, titanium, aluminum, etc.) so keeping ultrapure water "pure" is a matter of how much money you are willing to spend on purity or on your purity requirements.

Dale Woika
- Bellefonte, Pennsylvania, USA

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 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.