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CORROSION AND CHEMICAL WASTE IN SAWBLADES STEEL USED IN WOOD

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Author(s): Paulo Fernando Trugilho | Milena Freire de Carvalho Marcondes | José Tarcísio Lima | Fábio Akira Mori

Journal: Cerne
ISSN 0104-7760

Volume: 8;
Issue: 2;
Start page: 26;
Date: 2002;
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Keywords: Chemical waste | Sawblade | Steel | Wood.

ABSTRACT
The objective this work was to evaluate the chemical waste provoked by the wood on the sheets of steel used in the making of the mountains and cut tools. It was certain the correlationbetween the chemical waste and the extractive soluble in cold water, hot water and in the sequencetoluene and ethanol content. Two types of steel and twenty-seven species different from wood wereused. The corrosive agent, constituted of 50 g of fresh sawdust (moist) mixed to 50 ml of distilledwater, it was prepared and placed inside of the plastic box, hermetically closed, on the samples ofsteel, which were totally immersed. The box was placed in a water bath pre-heated to 75°C, that themedium temperature of reaction is considered, that affects the sheet of the sawblade in operation. Thisgroup was operated to 80 rotations per minute (rpm). The time of reaction was of four hours. Afterthat time the corrosive agent was discarded and the samples were washed, dried and weighed. At theend, each sample was processed by a total period of forty hours. The chemical waste was evaluated by the weight difference suffered from beginning at the end of the experiment. For theresults it was observed that the Eucalyptus tradryphloia and the Eucalyptus phaeotricha the speciesthat provoked were, respectively, the largest and smaller chemical waste for the two types of steelappraised. Great variation exists in the chemical waste due to the effect of the species. The corrosionand chemical waste are especially related with the quality of the material solved in ethanol. The 1070steel were more attached than the 6170 steel.
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