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Application Notes - British Defense
Technical
DataDetails
of Neutra Rust 661 Barrier
Reprinted from: British Defense Equipment Catalogue
Rust elimination and long-term protection
Neutra Rust®661 is a unique patented white organic copolymer latex with a specific gravity of 1.18g/l.
It dries on rusted surfaces and chemically converts these to a black non-tacky layer in 30 minutes under normal conditions, forming an independent complex iron/iron oxide/organic chemical compound which gives complete protection for the treated surface.
The continuous chemical curing of Neutra Rust®661 forms a chemical bond with every metal interface, passivating, neutralizing and chemically converting rust.
The black chemical compound layer is completely neutral and can be used as a primer, without further treatment, for standard or synthetic resin lacquers, oil-based paints, two- component lacquers or bitumastic and oil tar-based finishers including micaceous iron-oxide paints. Neutra Rust®66l has extremely low toxicity and does not contain phosphoric acid or lead.
Method of use
Depending on its condition, the surface to be treated will have to be degreased and wire-brushed to remove loose particles and dust.
The white Neutra Rust ®661 converter is then applied by brush or spray. Complete inhibition and protection is achieved immediately. The black protective compound formed on the rusted surfaces does not require washing or passivating.
Neutra Rust®661 is also an effective paint primer. Two or more coats of Neutra Rust®661 are used according to the rust density. Neutra Rust®661 can be left in its black finish, or can be over-painted.
Theory behind Neutra Rust 661
Newly formed rust is chemically ferric hydroxide [Fe(OH)3] or iron which has reacted with oxygen (air) and moisture. Iron can combine with oxygen to form a variety of oxides depending on conditions of exposure.
One of these oxides is magnetite [Fe3O4] or fersoferric oxide, a stable compound which does not readily change as exposure conditions change.
This stability is the basis for the protection. Neutra Rust®661 reduces ferric hydroxide to ferrous oxide, then combines with the ferrous oxide to form an organic fersofenic complex which, similar to magnetite, is passivated.
When incorporated into a coating system the chemical action of Neutra Rust®661 is maintained.
Status
Neutra Rust®661 has undergone several years of testing and has proved conclusively in environments ranging from
The above illustration shows a
cross-section of rusted metal before, during and after treatment with
Neutra Rust® 611
NEUTRA RUST® 661 has British Ministry of Defense ref No.0473-225 1,984,
NATO Codification No.8030-99-225 1984 and shows no rust after 500 hours
salt spray test in accordance with ASTM B1 17.
PRODUCTS ARE ENVIRONMENTALLY SAFE