CAJ | 학술논문

目的：研究Q420钢表面热镀锌工艺中,Zn和Zn-Al-Ni-RE合金镀层在酸性铜离子加速盐雾试验条件下的耐蚀性能。方法 Q420钢表面预处理后进行热镀锌,根据GB6460—1986进行铜加速醋酸盐雾腐蚀试验,对比纯Zn镀层与Zn-Al-Ni-RE合金镀层的耐蚀性。结果 Ni,RE等元素的加入使镀层表面光亮,组织更加细密。在酸性铜离子加速实验进行到192 h时,纯锌镀层的腐蚀质量损失是合金镀层的2.7倍；72 h后纯锌镀层出现红锈,120 h后合金镀层出现红锈,说明Zn-Al-Ni-RE合金镀层比纯Zn镀层更耐腐蚀。结论通过适量添加Al,Ni与稀土元素,能使Q420钢合金镀层的耐蚀性能大幅度提高。
목적：연구Q420강표면열도자공예중,Zn화Zn-Al-Ni-RE합금도층재산성동리자가속염무시험조건하적내식성능。방법 Q420강표면예처리후진행열도자,근거GB6460—1986진행동가속작산염무부식시험,대비순Zn도층여Zn-Al-Ni-RE합금도층적내식성。결과 Ni,RE등원소적가입사도층표면광량,조직경가세밀。재산성동리자가속실험진행도192 h시,순자도층적부식질량손실시합금도층적2.7배；72 h후순자도층출현홍수,120 h후합금도층출현홍수,설명Zn-Al-Ni-RE합금도층비순Zn도층경내부식。결론통과괄량첨가Al,Ni여희토원소,능사Q420강합금도층적내식성능대폭도제고。
Objective To study the corrosion resistance of hot dip galvanized pure Zn and Zn-Al-Ni-RE alloy coatings of high-strength steel Q420 under the acidic and copper accelerated salt spray corrosion condition. Methods On the basis of surface pre-treatment, the Q420 steel was treated by hot dip galvanizing. Copper accelerated acetic acid salt spray corrosion test was carried out according to GB 6460—1986, and the corrosion resistance of the pure Zn coating and Zn-Al-Ni-RE coating was compared. Results With the addition of Ni, RE and other elements, the coating surface was bright and the microstructure became finer. After 192 h, the corrosion weight loss of pure zinc coating was 2. 7 times higher than the corrosion weight loss of Zn-Al-Ni-RE alloy coatings un-der the acidic and copper accelerated salt spray corrosion condition. Pure zinc coating showed red rust after 72 h, while Zn-Al-Ni-RE alloy coating showed red rust after 120 h, so Zn-Al-Ni-RE alloy coating was more corrosion resistant than the pure Zn coating. Conclusion By means of adding nickel aluminum elements and rare earth elements, the corrosion resistance of alloy coating was greatly improved.