Abstract

MARULANDA, JOSE LUDDEY; TRISTANCHO, JOSE LUIS  and  CANAS, ADRIANA. PROTECTION AGAINST THE HOT CORROSION OF STEEL HOT ROLLED, BETWEEN TEMPERATURES OF 400ºC - 600ºC, COATED BY THERMAL SPRAY, WITH STAINLESS STEEL 312. Dyna rev.fac.nac.minas [online]. 2009, vol.76, n.160, pp.229-235. ISSN 0012-7353.

The hot corrosion was evaluated by gravimetric techniques in a hot rolled steel protected by thermal spraying with a 312 stainless alloy, with the equipment Rototec, in a mixture of salt 20% Na₂SO₄ - 80% V₂O₅, amoung 400ºC - 600ºC, during times of 1-7-22 hours. The test results showed a moderate protection of the layer thermally sprayed and presented high degradation in the protective coatings to 600ºC. It was concluded that the corrosion rate increases with temperature and decreases with exposure time.

Keywords : Hot corrosion; molten salts; coating by thermal spray.

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