摘要采用等離子(zi)熔(rong)(rong)覆(fu)(fu)(fu)技術(shu)在304不銹(xiu)鋼(gang)表面制備(bei)一(yi)層三元硼(peng)(peng)化物(wu)金屬陶瓷覆(fu)(fu)(fu)層。通(tong)過(guo)光學顯(xian)微(wei)鏡(jing)、X射線衍射和(he)掃(sao)描電鏡(jing)對熔(rong)(rong)覆(fu)(fu)(fu)層微(wei)觀(guan)(guan)結(jie)構和(he)相組成(cheng)進行(xing)了(le)表征，利(li)用顯(xian)微(wei)硬(ying)度計測試了(le)熔(rong)(rong)覆(fu)(fu)(fu)層的(de)硬(ying)度分(fen)布，并對熔(rong)(rong)覆(fu)(fu)(fu)層的(de)耐蝕性(xing)進行(xing)了(le)研究。結(jie)果(guo)表明：硼(peng)(peng)化物(wu)熔(rong)(rong)覆(fu)(fu)(fu)層與304不銹(xiu)鋼(gang)界面處(chu)沒有宏觀(guan)(guan)裂紋、孔洞(dong)等缺陷，形成(cheng)冶金結(jie)合；熔(rong)(rong)覆(fu)(fu)(fu)層平均(jun)顯(xian)微(wei)硬(ying)度為630.4 HV0.5，約是304不銹(xiu)鋼(gang) (HV0.5≤200) 的(de)3倍，有效提高了(le)3
2021-09-24 hualin
4.4.7.13 銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)合金(jin)的應力腐蝕及(ji)案例銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)具有(you)面心立方晶(jing)體結(jie)構，易于加(jia)工成形，具有(you)高(gao)的導電性(xing)及(ji)導熱性(xing)。銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)為(wei)正電性(xing)金(jin)屬(shu)，離子(zi)化為(wei)Cu2+和Cu+時(shi)，標(biao)準電極(ji)電位分別(bie)為(wei)0.337V和0.521V，因此，銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)有(you)較好的耐蝕性(xing)，是(shi)最廣泛使用(yong)(yong)(yong)的有(you)色金(jin)屬(shu)。常(chang)用(yong)(yong)(yong)的銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)及(ji)銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)合金(jin)有(you)4種(zhong)：純銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)，黃銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)，青(qing)銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)（錫青(qing)銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)Cu-Sn、鋁青(qing)銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)Cu-A1和硅(gui)青(qing)銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)Cu-Si）和白銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)（Cu-Ni），在壓力容器中純銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)與黃銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)使用(yong)(yong)(yong)較多。純銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)是(shi)指銅(tong)(tong)(tong)(tong)(tong)(tong)(tong)
2021-09-15 hualin
摘要利用(yong)增重(zhong)測試(shi)、掃描電(dian)鏡(jing) (SEM)、X射線衍射儀(yi) (XRD) 和(he)電(dian)子探針 (EPMA) 等分析(xi)技(ji)術，從氧化動力學(xue)、氧化膜相(xiang)組(zu)成(cheng)和(he)微觀結構方面，研究了(le)Ti60合(he)金在(zai)600 ℃下NaCl鹽霧環(huan)(huan)境中(zhong)(zhong)的(de)(de)腐(fu)蝕行為。結果表明，Ti60合(he)金在(zai)中(zhong)(zhong)溫NaCl鹽霧環(huan)(huan)境中(zhong)(zhong)腐(fu)蝕100 h后，其腐(fu)蝕速率遠遠低于(yu)在(zai)固態NaCl+H2O+O2環(huan)(huan)境中(zhong)(zhong)的(de)(de)。在(zai)NaCl鹽霧環(huan)(huan)境中(zhong)(zhong)表面形成(cheng)雙層腐(fu)蝕產物，外(wai)層相(xiang)對(dui)致密，以Na2TiO3
2021-09-13 hualin
摘要(yao)分析討論了(le)帶(dai)(dai)肋(lei)鋼(gang)(gang)在不同(tong)工(gong)況下的銹(xiu)蝕(shi)(shi)機理及(ji)影響因素(su)，分別從(cong)風沙沖(chong)蝕(shi)(shi)、雨水沖(chong)刷、大氣、淡水、海洋(yang)及(ji)核輻(fu)射6個(ge)方面闡(chan)述了(le)帶(dai)(dai)肋(lei)鋼(gang)(gang)服役過(guo)程腐(fu)(fu)蝕(shi)(shi)現象。結合當前社(she)會市場需求與(yu)已有防護技(ji)(ji)術(shu)，指出了(le)帶(dai)(dai)肋(lei)鋼(gang)(gang)防護技(ji)(ji)術(shu)的主要(yao)發展方向。關鍵詞： 帶(dai)(dai)肋(lei)鋼(gang)(gang) ; 工(gong)況 ; 腐(fu)(fu)蝕(shi)(shi)熱(re)軋(ya)帶(dai)(dai)肋(lei)鋼(gang)(gang)俗(su)稱螺紋鋼(gang)(gang)，是(shi)以低(di)合金鋼(gang)(gang)為(wei)原料，通過(guo)加(jia)熱(re)軋(ya)制而成的建筑“骨架”材(cai)料；冷(leng)軋(ya)帶(dai)(dai)肋(lei)鋼(gang)(gang)則(ze)是(shi)在熱(re)軋(ya)帶(dai)(dai)肋(lei)鋼(gang)(gang)基礎(chu)上(shang)進行冷(leng)加(jia)工(gong)消除應力，如(ru)冷(leng)拉(la)、拉(la)拔(ba)等獲(huo)得工(gong)
2021-09-06 hualin
摘(zhai)要在(zai)硫酸鹽還原菌(jun) (SRB) 接(jie)(jie)種的(de)模(mo)擬海洋溶(rong)(rong)液(ye)中，觀察并研(yan)究了SRB和(he)(he)外(wai)加(jia)應(ying)力對(dui)17-4 PH不銹鋼腐蝕行為的(de)作用。分(fen)析應(ying)力-應(ying)變曲線和(he)(he)斷口形(xing)貌，對(dui)比在(zai)無(wu)菌(jun)溶(rong)(rong)液(ye)和(he)(he)SRB接(jie)(jie)種溶(rong)(rong)液(ye)中的(de)腐蝕行為差異。結果表明，與無(wu)菌(jun)溶(rong)(rong)液(ye)相比，SRB接(jie)(jie)種溶(rong)(rong)液(ye)中單級時效(xiao)(xiao)、雙級時效(xiao)(xiao)和(he)(he)調質處理(li)試樣的(de)ISCC值分(fen)別提高(gao)了5.2%，9.3%和(he)(he)4.4%。FeS的(de)產生增強了陽極溶(rong)(rong)解過程并加(jia)速了腐蝕反應(ying)，雙級時效(xiao)(xiao)試樣組(zu)織中粗(cu)大的(de)馬氏
2021-08-27 hualin
一、形變(bian)(bian)(bian)強(qiang)化(hua)(hua)（或(huo)應變(bian)(bian)(bian)強(qiang)化(hua)(hua)，加(jia)工(gong)硬(ying)化(hua)(hua)）01 定義材(cai)料屈服以后，隨變(bian)(bian)(bian)形程(cheng)度(du)的(de)(de)增(zeng)加(jia)，材(cai)料的(de)(de)強(qiang)度(du)、硬(ying)度(du)升(sheng)高，塑性(xing)(xing)、韌性(xing)(xing)下降的(de)(de)現象叫形變(bian)(bian)(bian)強(qiang)化(hua)(hua)或(huo)加(jia)工(gong)硬(ying)化(hua)(hua)。02 機(ji)理隨著塑性(xing)(xing)變(bian)(bian)(bian)形的(de)(de)進行，位錯(cuo)(cuo)密度(du)不斷增(zeng)加(jia)，因此位錯(cuo)(cuo)在(zai)運動時的(de)(de)相互交割加(jia)劇，結(jie)(jie)果即產生固定的(de)(de)割階、位錯(cuo)(cuo)纏結(jie)(jie)等(deng)障礙，使位錯(cuo)(cuo)運動的(de)(de)阻(zu)力增(zeng)大，引起(qi)變(bian)(bian)(bian)形抗力增(zeng)加(jia)，給(gei)繼續塑性(xing)(xing)變(bian)(bian)(bian)形造成困難，從而提高金屬的(de)(de)強(qiang)度(du)規律：變(bian)(bian)(bian)形程(cheng)度(du)增(zeng)加(jia)，材(cai)料的(de)(de)強(qiang)度(du)、硬(ying)度(du)升(sheng)高，塑性(xing)(xing)、韌性(xing)(xing)下
2021-08-23 hualin
一(yi)、案例、1、換(huan)熱(re)器管(guan)(guan)(guan)箱(xiang)不銹鋼復合(he)層開裂(lie)概況：某(mou)裝(zhuang)置檢修(xiu)時(shi)發現一(yi)臺換(huan)熱(re)器管(guan)(guan)(guan)箱(xiang)內壁嚴重腐蝕。管(guan)(guan)(guan)程(cheng)基本參(can)數如下：管(guan)(guan)(guan)程(cheng)壓(ya)力(li)：設計(ji)2.68MPa、操(cao)(cao)作(zuo)(zuo)壓(ya)≤2.34MPa；管(guan)(guan)(guan)程(cheng)溫度：設計(ji)186℃，操(cao)(cao)作(zuo)(zuo)≤166℃；管(guan)(guan)(guan)程(cheng)介(jie)質(zhi)：中變氣(CH4：2.3%，CO2：13％，H2：80％，CO：1.1%，N2：2.5％)；管(guan)(guan)(guan)程(cheng)管(guan)(guan)(guan)箱(xiang)材質(zhi)：16MnR+304；管(guan)(guan)(guan)箱(xiang)焊(han)后熱(re)處理溫度為：620℃。圖(tu)：不銹鋼復合(he)層開裂(lie)2、失效原因
2021-08-17 hualin
1 概述某石化公司MTBE 裝(zhuang)置(zhi)萃(cui)取水(shui)冷(leng)卻(que)器(qi)，用(yong)于冷(leng)卻(que)甲醇回收塔經泵(beng)送來的(de)萃(cui)取水(shui)，管(guan)程(cheng)的(de)循環(huan)水(shui)冷(leng)卻(que)殼程(cheng)的(de)萃(cui)取水(shui)。管(guan)束(shu)規格為Φ25×2.5mm,材質10＃鋼(gang)，數量120根。裝(zhuang)置(zhi)投產運(yun)行(xing)(xing)以來，該水(shui)冷(leng)器(qi)管(guan)束(shu)泄露嚴重，多(duo)次腐(fu)蝕(shi)穿(chuan)孔(kong)，影響了裝(zhuang)置(zhi)的(de)正(zheng)常運(yun)行(xing)(xing)，裝(zhuang)置(zhi)多(duo)次對管(guan)束(shu)進(jin)行(xing)(xing)了更換，對泄漏穿(chuan)孔(kong)的(de)舊管(guan)束(shu)穿(chuan)孔(kong)換熱管(guan)進(jin)行(xing)(xing)失效分析(xi)。2 分析(xi)過程(cheng)2.1、宏觀檢驗(yan)：換熱管(guan)樣(yang)品見圖1。外壁表面附著黑(hei)色(se)、紅(hong)銹色(se)垢物；局部(bu)減薄
2021-08-17 hualin
