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Restek Performance Coatings Articles

Superior Protection Against Corrosion: Silcosteel®-CR

Treated Fittings and Tubing

by Gary Barone, Restek Performance Coatings Division
  • Exceptional protection from acids or seawater.
  • Will not chip, flake, or delaminate.
  • Custom treatments available.

Swagelok® fittings are world-renowned for meeting demanding standards. Now, a wide selection of Swagelok® products, available from stock with Restek's unparalleled surface treatments, set the highest standards for inertness and corrosion resistance.

Silcosteel®-CR treatment is highly effective protection for stainless steel fittings exposed to hydrochloric acid, nitric acid, or marine environments. In independent tests, Silcosteel®-CR treatment upgraded the corrosion resistance of 300-grade stainless steel by an order of magnitude, and totally protected samples against crevice corrosion (Figure 1).

Restek also sets the highest standard of inertness for transfer tubing for analytical and process applications. The near-mirror finish inside our electropolished tubing (surface roughness of only 5-7 micro-inches), in combination with our unequalled surface treatments, ensures superior inertness or greatly enhanced corrosion resistance. In systems used to transfer hydrochloric or nitric acid, or seawater, Silcosteel®-CR treated electropolished stainless steel tubing will last longer and require less maintenance than untreated tubing. We can provide continuous coils of treated 1/8" tubing up to 100 feet/30.5m long, or coils of 1/4" tubing up to 300 feet/91.4m long; these lengths of treated electropolished tubing are not available anywhere else.

If you need to construct a tubing system for a demanding application, you will not find more suitable components than Silcosteel®-CR treated tubing and Swagelok® fittings. If you already have the components of your system, or need unusual parts, Silcosteel®-CR or other Restek surface treatments can be applied to these parts on request.

To find out how Restek treated electropolished stainless steel tubing and Restek treated Swagelok® fittings can improve the reliability of your data, and/or minimize costly, time-consuming maintenance, contact our Technical Service Group at 800-356-1688 or 814-353-1300 (ext. 4), or your Restek representative, and speak with our surface treatment experts.


Figure 1  Silcosteel®-CR treated 316L stainless steel shows no crevice corrosion and only slight pitting corrosion.

Sample

Weight Loss (g/m²)

Silcosteel®-CR

19

Silcosteel®-CR

25

Silcosteel®-CR

25

Bare Steel

231

Bare Steel

209

Bare Steel

228

Photos and data follow exposure to 6% ferric chloride solution