装备环境工程
裝備環境工程
장비배경공정
EQUIPMENT ENVIRONMENTAL ENGINEERING
2015年
4期
1-5
,共5页
锌%大气腐蚀%电化学%微观分析%腐蚀机理
鋅%大氣腐蝕%電化學%微觀分析%腐蝕機理
자%대기부식%전화학%미관분석%부식궤리
zinc%atmospheric corrosion%electrochemistry%microscopic analysis%corrosion mechanism
目的：研究不同时间下锌在SO2环境中的腐蚀特性。方法采用室内加速试验法，向大气加速腐蚀箱中通入25 mg/L SO2气体，进行模拟工业大气环境下的加速腐蚀试验。对腐蚀后金属材料进行质量增量测量和电化学测试，通过XRD，SEM等表征锌腐蚀产物及腐蚀形貌，研究腐蚀特性。结果初期阶段锌在SO2环境中的腐蚀速率逐渐增加，到腐蚀后期逐渐降低，1/Rct值先增大后减小，锌的腐蚀产物中的元素包括Zn，O和少量的S，主要产物为Zn4SO4（OH）6。结论初期在锌表面生成的腐蚀产物疏松，SO2能够通过产物层到达基体，促进腐蚀，不具有保护性。到后期，产物增多并且致密使SO2与基体接触的概率降低，从而使腐蚀速率减缓。
目的：研究不同時間下鋅在SO2環境中的腐蝕特性。方法採用室內加速試驗法，嚮大氣加速腐蝕箱中通入25 mg/L SO2氣體，進行模擬工業大氣環境下的加速腐蝕試驗。對腐蝕後金屬材料進行質量增量測量和電化學測試，通過XRD，SEM等錶徵鋅腐蝕產物及腐蝕形貌，研究腐蝕特性。結果初期階段鋅在SO2環境中的腐蝕速率逐漸增加，到腐蝕後期逐漸降低，1/Rct值先增大後減小，鋅的腐蝕產物中的元素包括Zn，O和少量的S，主要產物為Zn4SO4（OH）6。結論初期在鋅錶麵生成的腐蝕產物疏鬆，SO2能夠通過產物層到達基體，促進腐蝕，不具有保護性。到後期，產物增多併且緻密使SO2與基體接觸的概率降低，從而使腐蝕速率減緩。
목적：연구불동시간하자재SO2배경중적부식특성。방법채용실내가속시험법，향대기가속부식상중통입25 mg/L SO2기체，진행모의공업대기배경하적가속부식시험。대부식후금속재료진행질량증량측량화전화학측시，통과XRD，SEM등표정자부식산물급부식형모，연구부식특성。결과초기계단자재SO2배경중적부식속솔축점증가，도부식후기축점강저，1/Rct치선증대후감소，자적부식산물중적원소포괄Zn，O화소량적S，주요산물위Zn4SO4（OH）6。결론초기재자표면생성적부식산물소송，SO2능구통과산물층도체기체，촉진부식，불구유보호성。도후기，산물증다병차치밀사SO2여기체접촉적개솔강저，종이사부식속솔감완。
ABSTRACT:Objective To study the characteristics of zinc corrosion on different time in SO2 environment. Methods Using the indoor accelerated test method, the accelerated corrosion experiment in simulated industrial atmospheric environment was carried out by filling 25 mg/L SO2 to the atmospheric accelerated corrosion box. Then mass weight measurement and electrochemical test were conducted for the corroded metal material. XRD and SEM were used to characterize the zinc corrosion products, observe the corrosion morphology and study the characteristics of corrosion. Results The corrosion rate of zinc in the SO2 environment increased in the early stages of corrosion, and decreased gradually in the late stage. The 1/Rct value first increased and then decreased. The elements in the corrosion products of zinc included Zn, O and a small amount of S, and the main product was Zn4SO4(OH)6. Conclusion In the early stage, the corrosion product formed on the zinc surface was loose, and SO2 could pass the product and arrive at the matrix to promote the corrosion, leaving the matrix unprotected. In the late stage, the increased and compact products decreased the probability for the contact of SO2 with the matrix, leading to reduced corrosion rates.
