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首页> 外文期刊>Metals >Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution ?
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Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution ?

机译：Q315NS钢在硫酸溶液中模拟焊接热影响区的组织与腐蚀行为？

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The microstructure evolution and the corrosion behavior of welding heat affected zone (HAZ) of Q315NS steel in 50 wt % H 2 SO 4 at 20 °C was investigated with thermal simulation technique, surface analysis and electrochemical tests. The microstructure of ferrite and pearlite was observed in base metal (BM), fine grained region (FGHAZ) and inter critical region (ICHAZ) while coarse grained region (CGHAZ) consisted of granular bainite. The CGHAZ exhibited the highest microhardness and the largest average grain size. The passivation process occurred on the surface of all specimens. Different microstructure give birth to different corrosion behaviors between CGHAZ and BM, FGHAZ, ICHAZ. The dense oxide film were formed on the surface of ferrite while oxide film with micro voids were formed on the surface of pearlite in BM, FGHAZ and ICHAZ after immersion in 50 wt % H 2 SO 4 solution for 12 h. The rod-shaped corrosion product was formed on the surface of CGHAZ while the porous-structured corrosion product was formed on the surface of BM, FGHAZ and ICHAZ after immersion in 50 wt % H 2 SO 4 solution for 72 h. The corrosion resistance of BM, CGHAZ, FGHAZ and ICHAZ increased during the first 12 h and then declined slowly with increasing immersion time. The BM had the best corrosion resistance while the CGHAZ had the lowest corrosion resistance throughout the corrosion process.
机译：通过热模拟技术，表面分析和电化学测试，研究了Q315NS钢在20％的50％H 2 SO 4中在50％H 2 SO 4中的焊接热影响区（HAZ）的组织演变和腐蚀行为。在贱金属（BM），细晶粒区（FGHAZ）和临界间区（ICHAZ）中观察到铁素体和珠光体的显微组织，而粗粒区（CGHAZ）则由粒状贝氏体组成。 CGHAZ表现出最高的显微硬度和最大的平均晶粒尺寸。钝化过程发生在所有样品的表面。不同的微观结构导致CGHAZ和BM，FGHAZ，ICHAZ之间的腐蚀行为不同。浸入50 wt％H 2 SO 4溶液12 h后，在BM，FGHAZ和ICHAZ中的珠光体表面上形成致密的氧化膜，在铁素体表面上形成具有微孔的氧化膜。浸入50 wt％H 2 SO 4溶液72 h后，在CGHAZ表面形成棒状腐蚀产物，而在BM，FGHAZ和ICHAZ表面形成多孔结构腐蚀产物。 BM，CGHAZ，FGHAZ和ICHAZ的耐腐蚀性在开始的12小时内增加，然后随着浸入时间的增加而缓慢下降。在整个腐蚀过程中，BM具有最佳的耐腐蚀性，而CGHAZ具有最低的耐腐蚀性。

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