Resumo

MARULANDA, JOSE; GARCIA, ANDRÉS  e  VITOLA, JOSE. (PROTECTION AGAINST THE HOT CORROSION OF CARBON STEEL BY THERMAL SPRAYING). Dyna rev.fac.nac.minas [online]. 2009, vol.76, n.157, pp.251-256. ISSN 0012-7353.

The hot corrosion was evaluated by gravimetric techniques in a low carbon steel protected by thermal spraying with a stainless alloy, in a mixture of salt 20% Na₂SO₄ - 80% V₂O₅, between 700ºC - 850ºC.. The gravimetric tests showed a weak protection of the layer thermal spraying. The test results showed a weak protection of the layer thermally sprayed and presented high degradation in the protective coatings because the exposure temperatures were higher than merging temperatures of the salts. It was concluded that the rate of corrosion increases with temperature and decreases with time of exposure.

Palavras-chave : Hot corrosion; molten salts; substrate; coating by thermal spray.

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