Corrosividade Causada por Soluções Salinas Empregadas na Estabilização Dimensional da Madeira

Abstract

RESUMOObjetivou-se avaliar a corrosividade de soluções salinas antes e depois de sua impregnação na madeira. Soluções com 5% de concentração de cloreto de lítio, carbonato de sódio, sulfato de magnésio, sulfato de zinco e sulfato de cobre II foram mantidas durante 6 horas, a 25 °C, 45 °C e 100 °C em contato com amostras de 1,25 cm × 0,1 cm × 7,5 cm (largura × espessura × comprimento) produzidas com chapas de aço carbono antes e depois de seu contato com amostras de madeira de Corymbia torelliana e Eucalyptus cloeziana. Não se observou efeito da temperatura na corrosão das soluções puras. Depois do contato com a madeira houve incremento da corrosividade para as soluções de sulfato de zinco e de cobre II. O sulfato de cobre II ocasionou a maior perda de massa nas chapas, não sendo recomendado seu contato com superfícies metálicas, como usinas de tratamento e câmaras de secagem de madeira.Palavras-chave: corrosão, soluções salinas, extrativos, madeira. Corrosivity Caused by Salt Solutions Employed in the Wood Dimensional Stability ABSTRACTThe study aimed to evaluate the corrosivity of salt solutions after and before the impregnation in the wood. Solutions with concentration of 5% of chloride of lithium, sodium carbonate, magnesium sulphate, zinc sulphate and copper sulphate II had been kept during 6 hours, at 25; 45 and 100 °C, in contact with steel plates carbon samples of 1.25 × 0.1 × 7.5 cm (width × thickness × length), before and after its contact with wood samples of Corymbia torelliana and Eucalyptus cloeziana.There was no effect of the temperature in the corrosion of the pure solutions. After the contact with woods, corrosivity was incremented with copper II and zinc sulphate solutions. Copper II sulphate caused the biggest loss of mass in plates, and its contact with metallic surfaces is not recommended as wood treatment and drying chambers.

EFFICIENCY OF IMPREGNATION WITH SALT SOLUTIONS IN THE RESISTANCE OF Corymbia torelliana AND Eucalyptus cloeziana WOODS TO DECAY FUNGY Postia placenta

“…Due to the increasing demand for use of Eucalyptus woods, which demonstrably have high dimensional instability (PAES et al, 2015), some new techniques for improving the characteristics of wood as your hygroscopicity, and which have characteristics fungicides (PAES et al, 2013). However, due to the environmental pressures, the development of products of wood preservatives that are less harmful to the environment, when compared to traditional and effective products, which are made up of base metals such as copper, chromium, arsenic, boron and amines, which are not corrosive to metals (PAES et al, 2017), in order to meet, more broadly, the timber market (MARCHESAN, et al 2015).…”