含三唑复合防腐剂及其竹处理材的金属腐蚀性能

王卿平; 曹金珍; 张景朋; 蒋明亮

doi:10.13332/j.1000-1522.20190232

含三唑复合防腐剂及其竹处理材的金属腐蚀性能

Metal corrosion performance of triazole-containing compound preservatives and treated bamboo

摘要

摘要:
目的探究三唑复合防腐剂及其竹处理材对金属连接件的腐蚀性和适用性，为选择处理设备材质和竹处理材防水涂层提供参考。
方法参考GB/T 34726—2017《木材防腐剂对金属的腐蚀速率测定方法》和GB/T 34724—2017《接触防腐木材的金属腐蚀速率加速测定方法》标准，测定复合防腐剂（有效成分：丙环唑−戊唑醇（PPZ-TEB）、碘丙炔基正丁氨基甲酸酯（IPBC）、异噻唑啉酮（CMIT-MIT））及其毛竹处理材对Q235碳钢、65Mn弹簧钢、304不锈钢、201不锈钢、H59黄铜、T2紫铜、7075铝合金和6061铝合金的金属腐蚀性。通过在竹材−金属组件表面涂刷水性聚氨酯漆、水性丙烯酸漆和木蜡油考察表面涂饰对防腐蚀效果的影响。
结果（1）经复合防腐剂浸泡加速腐蚀后，304不锈钢、201不锈钢、6061铝合金和7075铝合金的金属腐蚀速率均为0；Q235碳钢和65Mn弹簧钢的金属腐蚀速率随时间增加保持不变，且腐蚀速率离散性前期较大，后期逐渐减小；H59黄铜和T2紫铜在制剂A（PPZ-TEB）、C（PPZ-TEB/CMIT-MIT）、CK₁（CMIT-MIT）和CK₂（素材）中浸泡腐蚀和与竹处理材接触腐蚀的金属腐蚀速率均为0，而浸泡在制剂B（PPZ-TEB/IPBC）中发生轻微腐蚀。（2）在与竹处理材接触加速腐蚀后，304不锈钢、201不锈钢、H59黄铜和T2紫铜的金属腐蚀速率为0；Q235碳钢和65Mn弹簧钢腐蚀速率随时间增加而减小并趋于平缓，且腐蚀程度明显大于防腐剂对金属的腐蚀；6061铝合金和7075铝合金发生轻微腐蚀。（3）不同复合制剂及其竹处理材对Q235碳钢和65Mn弹簧钢的腐蚀性分别为CK₁ > C > B > A > CK₂，C > CK₁ > B > A > CK₂。（4）在Q235碳钢和65Mn弹簧钢的竹材−金属组件表面涂饰水性聚氨酯漆、水性丙烯酸漆和木蜡油涂层后，竹处理材的金属腐蚀速率均有所下降，且木蜡油较水性聚氨酯漆和水性丙烯酸漆的防腐蚀效果更优。
结论含三唑复合防腐剂及其竹处理材对304不锈钢和201不锈钢均无腐蚀。复合防腐剂及其竹处理材对H59黄铜和T2紫铜基本无腐蚀。复合防腐剂对Q235碳钢和65Mn弹簧钢的腐蚀速率随时间增加保持不变，而竹处理材腐蚀速率随时间增加而减小并趋于平缓，且前者小于后者。复合防腐剂对7075铝合金和6061铝合金无腐蚀，而竹处理材有轻微腐蚀。不同复合制剂及其竹处理材对Q235碳钢和65Mn弹簧钢的腐蚀性均为C > B > A。表面涂饰可降低竹处理材对金属的腐蚀性。

Abstract:
ObjectiveTo provide a reference for selecting equipment materials and treated bamboo coatings, the corrosiveness and applicability of triazole-containing compound preservatives and treated bamboo for metal fasteners were investigated.
MethodReferring to the GB/T 34726—2017 and GB/T 34724—2017 standards, the metal corrosiveness of compound preservatives (active ingredient: propiconazole-tebuconazole (PPZ-TEB), iodopropynyl butylcarbamate (IPBC), isothiazolinone (CMIT-MIT)) and treated Moso bamboo (Phyllostachys edulis) was determined for Q235 carbon steel, 65Mn spring steel, 304 stainless steel, 201 stainless steel, H59 brass, T2 copper, 7075 aluminum alloy and 6061 aluminum alloy. The effect of coating on corrosion resistance was investigated by coating waterborne polyurethane varnish, waterborne acrylic varnish and wood wax oil on surfaces of bamboo-metal assemblies.
Result(1) After accelerated corrosion by soaking in compound preservatives, the corrosion rates of 304 stainless steel, 201 stainless steel, 6061 aluminum alloy and 7075 aluminum alloy were 0; the corrosion rates of Q235 carbon steel and 65Mn spring steel remained constant with time, and the discretization of them was larger in the early stage and gradually decreased in the later stage; the metal corrosion rates of H59 brass and T2 copper soaking in A, C, CK₁ and CK₂ and contacting treated bamboo were 0, and both metals soaking in B had slight corrosion. (2) After accelerated corrosion by contacting treated bamboo, the corrosion rates of 304 stainless steel, 201 stainless steel, H59 brass and T2 copper were 0; the corrosion rates of Q235 carbon steel and 65Mn spring steel decreased with time and tended to be flat, and the corrosion degree was significantly greater than that of compound preservatives; 6061 aluminum alloy and 7075 aluminum alloy had slight corrosion. (3) The corrosiveness of compound preservatives and treated bamboo for Q235 carbon steel and 65Mn spring steel was respectively: CMIT-MIT (CK₁) > PPZ-TEB/CMIT-MIT (C) > PPZ-TEB/IPBC (B) > PPZ-TEB (A) > Untreated (CK₂) and C > CK₁ > B > A > CK₂. (4) After coating the surfaces of bamboo-metal assemblies of Q235 carbon steel and 65Mn spring steel with waterborne polyurethane varnish, waterborne acrylic varnish and wood wax oil, the corrosion rates of treated bamboo showed reduction. Wood wax oil had better corrosion resistance than waterborne polyurethane varnish and waterborne acrylic varnish.
ConclusionThe triazole-containing compound preservatives and treated bamboo are not corrosive to 304 stainless steel and 201 stainless steel. The compound preservatives and treated bamboo are almostly not corrosive to H59 brass and T2 copper. The corrosion rates of compound preservatives for Q235 carbon steel and 65Mn spring steel remain constant with time, while the corrosion rates of treated bamboo decrease with time and tend to be flat. And the former is smaller than the latter. The compound preservatives have no corrosion for 7075 aluminum alloy and 6061 aluminum alloy, and treated bamboo has slight corrosion. The corrosiveness performance of compound preservatives and treated bamboo for Q235 carbon steel and 65Mn spring steel is: C > B > A. The corrosiveness performance of treated bamboo can be reduced by coating.

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