TG, DTG and DSC curves are presented and analytical results, obtained by thermogravimetry and DSC calorimetry, of ancient, fresh and waterlogged wood samples, are discussed. The criteria by which the percent content of iignin, cellulose, water and ashes (residue after heating at 700 ~ were obtained by thermogravimetry, are outlined. Finally DSC curves are reported and the degradation which happen in some wood samples evidenced, especially in the case of waterlogged wood.
The level of surface‐carbon contamination exerts an adverse influence on the subsequent coating process such as phosphating and painting. In evaluating quantitatively surface carbon by the combustion technique, the temperature programmes adopted do not exceed 500°C in the case of sheet produced by continuous annealing system and 600°C for batch‐annealed sheet, this to avoid matrix‐carbon combustion. In this paper two hypotheses are discussed, concerning the reasons why evolution of the matrix carbon occurs at different temperatures in the two types of steel products. It is shown that different grain sizes generated by the batch and continuous annealing processes induce diversity in the different surface reactivities, in fact, grain size and hence the concentration of surface grain boundaries increases the oxidation rate of carbon.
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