铜唑(CA-C)/石蜡防水剂复配处理材的金属腐蚀性能  

Metal Corrosion of Copper Azole(CA-C)/Paraffin Wax Emulsion Compound System Treated Wood

作　　者：王佳敏[1] 马尔妮[1] 曹金珍[1] 

机构地区：[1]北京林业大学材料科学与技术学院,北京100083

出　　处：《林业科学》2015年第8期74-80,共7页Scientia Silvae Sinicae

基　　金：中央高校基本科研业务费专项基金资助(TD2011-14)

摘　　要：【目的】在 CA防腐剂中添加石蜡乳液防水剂，探究石蜡乳液对处理材金属腐蚀性的影响，为解决木材防腐行业中的金属腐蚀性问题提供技术依据。【方法】选用3种浓度的石蜡乳液（0．5%，1%和2%）与2种浓度的CA防腐剂（0．3%和0．5%）进行复配，利用满细胞法一次性处理尺寸为19 mm（ T）×38 mm（ R）×89 mm（ L）的美国南方松边材，计算处理材的增重率和铜的载药量，并参照美国木材保护协会标准AWPA E12-08对304不锈钢、热镀锌钢、Q235A钢3种金属的金属腐蚀性进行测试。【结果】1） CA单独处理材中铜的载药量分别为（1.81±0.12）和（3．800．03）kg·m －3，达到预设防腐等级C3（≥1．7 kg·m －3）和C4A（≥3．3 kg·m －3）的载药量要求；2）腐蚀后的金属表面，Q235A钢被腐蚀最严重，表面有大量附着红色的铜单质，热镀锌钢有轻微腐蚀，304不锈钢基本不被腐蚀；3）各组处理材对304不锈钢的金属腐蚀率均为0；CA单独处理材对 Q235A 钢的金属腐蚀率为素材的2～3倍，添加石蜡乳液防水剂后复配处理材的金属腐蚀率明显降低；处理材对于热镀锌钢的腐蚀规律与 Q235A钢相似，但腐蚀率小很多。【结论】1）处理材对3种金属的腐蚀程度为 Q235A钢＞热镀锌钢＞304不锈钢；2） CA 防腐剂会加剧处理材对 Q235A钢和热镀锌钢的腐蚀；单独石蜡乳液防水剂处理材对 Q235A 钢的腐蚀略比素材低，对热镀锌钢的腐蚀与素材无明显差别；3）在CA防腐剂中添加石蜡乳液防水剂可以明显降低CA处理材对Q235A钢和热镀锌钢的腐蚀，且随着石蜡乳液浓度的增大，处理材的金属腐蚀率减小。Objective]Copper azole （ CA ） as a new generation of environmentally friendly water-borne wood preservative,its treated wood tends to accelerate the corrosion process of mental. To provide technical basis for reducing metal corrosion issue in wood preservation,the effects of adding paraffin wax emulsion into CA preservative on the metal corrosion of treated wood was investigated.[Method]In this work,two concentrations of CA（0. 3% and 0. 5%） were combined with three concentrations of paraffin wax emulsion（0. 5%,1% and 2%）to treat sapwood of Pinus spp. with the size of 19 mm（T） × 38 mm（R） × 89 mm（L）,using a full-cell process. Weight percent gain（WPG）and retention of copper in treated wood were calculated. Furthermore,the metal corrosion of 304 stainless steel,hot dip galvanized steel and Q235 A steel contacted with CA /paraffin wax emulsion compound system treated wood were tested according to the American Wood Protection Association Standard AWPA E12-08,respectively.[Result]1） The retentions of copper in CA treated wood were（1. 81 ± 0. 12）kg·m - 3 and（3. 80±0. 03）kg·m - 3 respectively,reaching use category C3（≥1. 7 kg·m - 3） and C4A（≥3. 3 kg·m - 3）. 2） Q235A was the most prone to corrosion with a large area of red copper element on the surface. Hot dip galvanized steel showed mild corrosion and 304 stainless steel was almost not corroded. 3） All corrosion rate of 304 stainless steel was 0; corrosion rate of Q235 A steel contacted with CA treated wood was twice or three times as much as the control,adding paraffin wax emulsion could obviously reduce the metal corrosion rate; the tendency in corrosion of hot dip galvanized steel was similar to that of Q235A steel,but its corrosion rate was much lower.[Conclusion]1 ） Corrosion rate of the three metals contacted with treated wood was exhibited in the following order：Q235A steel ＆gt; hot dip galvanized steel ＆gt; 304 stainless steel. 2） After CA treatment,wood presented much more serious corrosion

关 键 词：木材 石蜡防水剂 防腐 复配 金属腐蚀性 

分 类 号：S781.72[农业科学—木材科学与技术]