Oil & Gas

Silcolloy™ 1000 Surface Treatment

Corrosion Control for oil, gas and off-shore applications.
Corrosion currently costs the United States economy $276 billion per year (1) and costs the world economy even more. In acidic environments it is critical to engineer solutions to account for the depreciation of equipment caused by corrosion. Current commercial solutions that address corrosion are specialized alloys, such as Inconel®, Monel® and Hastelloy®—or coatings.

Silcolloy ™1000, an effective, durable solution at lower cost than special alloys.
We developed Silcolloy™ 1000 (formerly Silcosteel®-CR) treatment to protect equipment exposed to hydrochloric acid, nitric acid, sulfuric acid, or marine environments. Silcolloy™ 1000 treatment upgrades the corrosion resistance of 300-grade stainless steels by an order of magnitude.

An advantage of Silcolloy™ 1000 treatment over super-alloy solutions is cost. Many of the high nickel super-alloys, such as Inconel®, Monel® and Hastelloy® are expensive and machining costs are higher for these soft materials than for 300-grade stainless steels.

Silcolloy™ 1000 treatment also offers major advantages over traditional coatings. Our chemical vapor deposition process incorporates the treatment into the stainless steel lattice. Traditional overlay coatings rely primarily on primers or surface tension to remain in contact. The Silcolloy™ 1000 process eliminates delamination, a common problem with overlay coatings.

Silcolloy™ 1000, treatment protects equipment exposed to hydrochloric acid, nitric acid or marine environments.
A Silcolloy™ 1000 layer is both durable and flexible. The layer builds from many starting points on the steel surface. Repeated overlaying as the deposition grows on the surface creates a dense, impenetrable layer. This layering process also creates flexibility—treated components can be worked into place without cracking, chipping, or otherwise damaging the layer.

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Pitting and Crevice Corrosion Tests
In studies of exposure to 6% w/w ferric chloride, Silcolloy™ 1000 treated 316L stainless steel outperformed untreated 316L steel by a factor of 10. This test was conducted per ASTM G48, Method B.

4000 Hour Salt Spray Tests
Silcolloy™ 1000 treated 316L stainless steel coupons show no sign of attack after 4000-hour salt spray exposure, per ASTM B117.

Condensing Humidity Tests
Silcolloy™ 1000 treated 316L steel withstands environments simulating outdoor exposure, per ASTM D 4585.

Cyclic Polarization Electrochemical Tests
Electrochemical corrosion testing of Silcolloy™ 1000 treated 316L stainless steel yielded the following corrosion and pitting potentials in neutral and acidic conditions, per ASTM G61.

References
(1)Corrosion Costs and Preventive Strategies in the United States U.S. Department of Transportation Federal Highway Administration, Publication No. FHWA-RD-01-156.

Breakdown or pitting potential, Eb, in millivolts.

Corrosion of Silcolloy™ 1000 treated 316L stainless steel versus bare stainless steel at 3000ppm Cl- concentration.