The hygroscopic and electrical properties of the wood surface of Norway spruce (Picea abies (L.) Karst.) and common beech (Fagus sylvatica L.) were altered by the application of differently concentrated NaCl aqueous solutions. The presence of Na⁺ and Cl^– ions increased the equilibrium moisture content in both woods in environments with a relative humidity of 75% to a nearly saturated state. The electrical resistance of the wood decreased, while the electrical capacitance of the wood increased with increasing amounts of NaCl introduced. Inverse trends were observed for both properties in wood modified with the two most concentrated solutions (18 and 36% molality). Microscopic analysis of the outer layers of the wood samples using scanning electron microscopy and energy-dispersive X-ray spectroscopy showed that the amount of NaCl decreased linearly up to about 1 mm from the modified surface. The presence of Na⁺ and Cl^– ions in wood increased the intensity and improved the homogeneity of the plasma discharge generated during treatment of samples in air at atmospheric pressure. Both modification of wood with NaCl and subsequent treatment with plasma increased the surface roughness of the substrates. Finally, it was shown that the wettability of wood with a waterborne coating was improved after plasma treatment, regardless of the presence of NaCl on the surface. These findings have a good potential not only for the study of surface treatment processes of wood with plasma discharges, but also for other technical applications of lignocellulosic materials.

挪威云杉（Picea abies（L.）Karst。）和普通山毛榉（Fagus sylvatica L.）木材表面的吸湿性和电学性能通过使用不同浓度的NaCl水溶液而改变。Na ⁺和Cl ^–的存在离子在相对湿度为75％的环境中达到接近饱和状态时，两种木材中的平衡水分含量都增加了。木材的电阻降低，而木材的电容随着引入的NaCl量的增加而增加。在用两种浓度最高的溶液（摩尔浓度为18％和36％）改性的木材中，观察到了两种性质的相反趋势。使用扫描电子显微镜和能量色散X射线光谱法对木材样品的外层进行微观分析，结果表明，距改性表面约1mm处，NaCl的含量呈线性下降。Na ⁺和Cl ^–的存在木材中的离子增加了强度，并改善了大气压下在空气中处理样品过程中产生的等离子体放电的均匀性。用NaCl改性木材和随后用等离子体处理都增加了基材的表面粗糙度。最后，结果表明，等离子处理后，无论表面是否存在氯化钠，具有水性涂料的木材的润湿性都得到了改善。这些发现不仅在研究等离子体放电木材的表面处理工艺方面，而且在木质纤维素材料的其他技术应用方面都具有良好的潜力。