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不銹鋼晶間腐蝕研究+文獻綜述

時間:2019-04-20 14:25來源:畢業論文
從不同的標準角度入手來檢測材料的耐晶間腐蝕性能。研究了原材料、敏化未腐蝕、敏化腐蝕、未敏化直接腐蝕的情況下,試樣的彎曲宏觀形貌、金相組織、SEM掃描圖像,從宏觀形貌和

摘要:本課題為不銹鋼晶間腐蝕研究,主要研究不銹鋼在不同情況下的腐蝕性能。本文主要討論:從不銹鋼的腐蝕浸泡實驗,采用GB/T4334-2008-E(我國國家標準)、ASTM A262-02a(2002) E(美國標準)和RCC-M1310(法國標準)這三種標準來測試304型不銹鋼的耐晶間腐蝕性能,從宏觀的彎曲形貌、金相照片以及SEM掃描照片考察材料的耐晶間腐蝕性能。對于304 的材料在ASTM、RCC-M、GB/T的標準下進行敏化和腐蝕實驗,可以發現RCC-M標準下,彎曲的樣品出現了褶皺和微裂紋,金相和SEM掃描圖像均出現了較為明顯的晶間腐蝕形貌,所以RCC-M標準在此304樣品下作為敏化和腐蝕標準更容易出現晶間腐蝕傾向。34709
不銹鋼由于其優良的抗均勻腐蝕性能,現在已經在全世界的汽車工業、水工業、建筑業、家電業、環保工業、工業設施等很多的領域都得到了非常廣泛的應用。可是如果在450-900℃的腐蝕性介質中使用的話,不銹鋼就非常容易發生晶間腐蝕,甚至會導致應力腐蝕開裂。這是不銹鋼因為碳在較低的溫度下會以富鉻碳化物的形式析出,這就會讓晶界和鄰近區域的鉻含量下降,從而就形成了貧鉻區,所以發生晶間腐蝕。這個貧鉻區非常容易被腐蝕,導致晶間腐蝕或者應力腐蝕開裂。所以這就需要對不銹鋼材料應用之前通過實驗方法檢測是否會產生晶間腐蝕,例如,采用硫酸-硫酸銅-銅屑法、沸騰硝酸法、硝酸-氟化物法、硫酸-硫酸鐵法。本論文采取硫酸-硫酸銅-銅屑法為主要方法作為腐蝕實驗,并且按照三個不同的晶間腐蝕試驗標準為: GB/T4334-2008-E(我國國家標準)、ASTM A262-02a(2002) E(美國標準)和RCC-M 1310(法國標準)分別進行敏化和腐蝕,從不同的標準角度入手來檢測材料的耐晶間腐蝕性能。研究了原材料、敏化未腐蝕、敏化腐蝕、未敏化直接腐蝕的情況下,試樣的彎曲宏觀形貌、金相組織、SEM掃描圖像,從宏觀形貌和微觀形貌方面來觀察試樣產生晶間腐蝕的情況。 源¥自%六:維;論-文'網=www.aftnzs.live
 畢業論文關鍵詞:304不銹鋼,晶間腐蝕,鉻含量
Corrosion of stainless steel
The issue is to discuss ntergranular corrosion of stainless steel,Mainly in order to study the stainless steel indifferent situations corrosion.This article focuses on:For the stainless steel corrosion immersion experiments, GB/T4334-2008-E (China's national standard), ASTM A262-02a (2002) E (U.S. standard) and the RCC-M1310 (French standards) these three criteria are adopted to test four different types of 304 stainless steel to intergranular corrosion resistance, from a macro morphology of a bending sample, SEM photomicrographs and scanning photos.304 stainless steel for materials in ASTM, RCC-M, GB / T standard under sensitized and corrosion experiments can be found RCC-M standard, curved samples appeared folds and microcracks, optical and SEM were scanned image appears more obvious intergranular corrosion morphology, so RCC-M standard in this 304 sample as a sensitizer and more prone to corrosion standards tendency to intergranular corrosion.
Stainless steel is widely used in many areas such as the automobile industry, the water industry, construction, household appliances industry, environmental industry and industrial facilities due to its excellent resistance to uniform corrosion performance. However, if used in the corrosive medium at 450-900℃, the stainless steel is easily found the occurrence of intergranular corrosion, and even the stress corrosion cracking. Since the carbon steel separate out in the form of precipitation of chromium-rich carbides at a lower temperature, which makes the chromium content near the grain boundary region and down to form a chromium depleted zone, the intergranular corrosion occurs. The chromium depleted zone is very susceptible to corrosion, resulting in intergranular corrosion or stress corrosion cracking. Before application, stainless steel needs to be detected experimentally whether intergranular corrosion will occur, for example, sulfuric acid-copper-copper scrap method, boiling nitric acid, nitric acid-fluoride method and sulfuric acid-ferric sulfate method. In this paper, acid-copper-copper scrap is taken as the main method of corrosion test, and following are three different intergranular corrosion test standards: GB/T4334-2008-E (China's national standard), ASTM A262-02a (2002 ) E (U.S. standard) and the RCC-M 1310 (French standards). They are sensitized and corrosion from a different point of view to detect the material standard of resistance to intergranular corrosion. Materials are pided into four conditions, such as original one, sensitization but not corrosion, sensitization corrosion, not sensitized but corrosion. macro-morphology of the bending sample, microstructure, SEM scanning images from the macro aspects of the morphology and microstructure are used to observe trial kind of produce cases intergranular corrosion. Though traditional methods can be used to detect intergranular corrosion of stainless steel, there are some undesirable places. The role of the sample is damaged, or it takes a long time, or the degree of intergranular corrosion can not be quantitatively detected. So a rapid, non-destructive detection method is needed. 不銹鋼晶間腐蝕研究+文獻綜述:http://www.aftnzs.live/huaxue/20190420/32309.html
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