1. 動電位(wei)極(ji)化曲線分(fen)析


  2507雙相不銹鋼經1000℃、1050℃、1100℃、1150℃及1200℃固溶處理后于30℃在3.5%NaCl溶液中的動電位極化曲線如圖5.3所示。從圖5.3可知各固溶溫度下2507雙相不銹鋼(gang)的極化曲線形狀大體相同，都具有明顯的鈍化區域，且鈍化區域都較寬。國標GB 4334.9-1984規定陽極極化曲線上與電流密度值為100μA/c㎡相應的電位為擊破電位（Eb),擊破電位指金屬材料最先產生點腐蝕的電位，其值越高表明材料產生孔蝕的傾向越低。當2507雙相不銹鋼主要化學成分一定時，其表面保護膜的均勻性及穩定性跟鋼的兩相組織（α相及γ相）有著密切聯系，鋼中的α相和γ相分布均勻、相比例接近1:1時保護膜比較穩定且對鋼的點蝕行為有較好的阻礙作用；當鋼中的α相和γ相分布不均勻時易導致鋼表面保護膜遭受破壞，降低鋼的抗點蝕性能。經過不同固溶溫度處理的DSS2507的擊破電位（Eb)值如表5.1所列。從表5.1可知DSS2507于3.5%NaCl溶液中的擊破電位（Eb)隨著固溶熱處理溫度的上升呈現先變大后減小的走勢，1050℃時點蝕電位值最高，表明該固溶溫度下2507雙相鋼發生點蝕的傾向較低。固溶溫度為1000℃時2507雙相不銹鋼中鐵素體相跟奧氏體相界處有σ相析出，其附近較易形成貧鉻及貧鉬區域，造成該固溶熱處理溫度下鋼的抗點腐蝕能力較弱；1050℃時DSS2507中的兩相結構（鐵素體α相及奧氏體y相）分布較均勻，相比例約為1:1,有利于鋼表面鈍化膜的穩定，進而對點蝕具有較好的抑制作用，表現為點蝕電位Eb值較高；然而隨固溶熱處理溫度繼續上升，鐵素體α相量增多奧氏體γ相量減少，導致鐵素體形成元素Cr和Mo的濃度減小，而奧氏體形成元素N濃度升高，因此Cr、Mo和N在這兩種組織結構中的分布變得不均勻，由于Cr、Mo和N是鋼的主要耐點蝕元素，因此鋼的耐腐蝕能力降低。具體表現為點蝕電位E,值降低，所以在1050~1200℃溫度范圍內2507雙相不銹鋼的點蝕電位降低。此外從表5.1中列出的（Eb-Ecom)值可以看出其值變化趨勢跟點蝕電位（Eb)值的變化趨勢相同，都呈先升高后降低的趨勢。由于（Eb-Ecom)差值表示形核阻力的大小，因此由（Eb-Ecom)差值變化趨勢可知點蝕形核的阻力也是先增大后減小，即隨著固溶溫度的升高鋼的抗點蝕性能呈先增強后減弱的趨勢。此外從表5.1中可以看出，隨固溶熱處理溫度的上升自腐蝕電流密度（Icorr)先降低后增高，1050℃時自腐蝕電流密度較低為3.5367×10-7A/c㎡.綜上所述，固溶處理溫度為1050℃時2507雙相不銹鋼有較好的抗腐蝕能力。


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  固(gu)溶(rong)態為(wei)1050℃的(de)(de)(de)2507雙相(xiang)(xiang)(xiang)(xiang)(xiang)不銹(xiu)鋼于(yu)3.5%NaCl溶(rong)液中(zhong)(zhong)(zhong)動(dong)電(dian)(dian)位極化后的(de)(de)(de)腐(fu)蝕(shi)(shi)形貌(mao)如圖5.4所示，圖中(zhong)(zhong)(zhong)深色是鐵(tie)(tie)(tie)(tie)素(su)(su)(su)(su)體(ti)(ti)(ti)(ti)α相(xiang)(xiang)(xiang)(xiang)(xiang)、淺色是奧(ao)(ao)氏體(ti)(ti)(ti)(ti)y相(xiang)(xiang)(xiang)(xiang)(xiang)、黑色圓點(dian)(dian)是點(dian)(dian)蝕(shi)(shi)坑(keng)。從圖5.4可知點(dian)(dian)蝕(shi)(shi)坑(keng)主要(yao)存在(zai)于(yu)鐵(tie)(tie)(tie)(tie)素(su)(su)(su)(su)體(ti)(ti)(ti)(ti)x相(xiang)(xiang)(xiang)(xiang)(xiang)上，這說明奧(ao)(ao)氏體(ti)(ti)(ti)(ti)y相(xiang)(xiang)(xiang)(xiang)(xiang)比(bi)鐵(tie)(tie)(tie)(tie)素(su)(su)(su)(su)體(ti)(ti)(ti)(ti)α相(xiang)(xiang)(xiang)(xiang)(xiang)要(yao)穩(wen)定(ding)，有著較(jiao)優的(de)(de)(de)抗點(dian)(dian)腐(fu)蝕(shi)(shi)性能(neng)。奧(ao)(ao)氏體(ti)(ti)(ti)(ti)γ相(xiang)(xiang)(xiang)(xiang)(xiang)相(xiang)(xiang)(xiang)(xiang)(xiang)比(bi)于(yu)鐵(tie)(tie)(tie)(tie)素(su)(su)(su)(su)體(ti)(ti)(ti)(ti)α相(xiang)(xiang)(xiang)(xiang)(xiang)有較(jiao)好的(de)(de)(de)抗點(dian)(dian)蝕(shi)(shi)性能(neng)的(de)(de)(de)原因(yin)在(zai)于(yu)元(yuan)素(su)(su)(su)(su)N的(de)(de)(de)作用。元(yuan)素(su)(su)(su)(su)N是奧(ao)(ao)氏體(ti)(ti)(ti)(ti)形成元(yuan)素(su)(su)(su)(su)，于(yu)奧(ao)(ao)氏體(ti)(ti)(ti)(ti)γ相(xiang)(xiang)(xiang)(xiang)(xiang)中(zhong)(zhong)(zhong)的(de)(de)(de)溶(rong)解(jie)度要(yao)比(bi)在(zai)鐵(tie)(tie)(tie)(tie)素(su)(su)(su)(su)體(ti)(ti)(ti)(ti)α相(xiang)(xiang)(xiang)(xiang)(xiang)中(zhong)(zhong)(zhong)的(de)(de)(de)大，此外N能(neng)夠讓(rang)Cr和Mo元(yuan)素(su)(su)(su)(su)從鐵(tie)(tie)(tie)(tie)素(su)(su)(su)(su)體(ti)(ti)(ti)(ti)α相(xiang)(xiang)(xiang)(xiang)(xiang)遷移到奧(ao)(ao)氏體(ti)(ti)(ti)(ti)γ相(xiang)(xiang)(xiang)(xiang)(xiang)中(zhong)(zhong)(zhong)，N顯著影響(xiang)著這兩種元(yuan)素(su)(su)(su)(su)在(zai)奧(ao)(ao)氏體(ti)(ti)(ti)(ti)γ相(xiang)(xiang)(xiang)(xiang)(xiang)和鐵(tie)(tie)(tie)(tie)素(su)(su)(su)(su)體(ti)(ti)(ti)(ti)α相(xiang)(xiang)(xiang)(xiang)(xiang)中(zhong)(zhong)(zhong)的(de)(de)(de)分配，兩相(xiang)(xiang)(xiang)(xiang)(xiang)中(zhong)(zhong)(zhong)合金元(yuan)素(su)(su)(su)(su)含量的(de)(de)(de)差(cha)值隨N元(yuan)素(su)(su)(su)(su)含量的(de)(de)(de)增多而(er)降低，所以奧(ao)(ao)氏體(ti)(ti)(ti)(ti)γ相(xiang)(xiang)(xiang)(xiang)(xiang)的(de)(de)(de)點(dian)(dian)蝕(shi)(shi)電(dian)(dian)位較(jiao)鐵(tie)(tie)(tie)(tie)素(su)(su)(su)(su)體(ti)(ti)(ti)(ti)α相(xiang)(xiang)(xiang)(xiang)(xiang)要(yao)高，從而(er)蝕(shi)(shi)坑(keng)較(jiao)先(xian)在(zai)Eb相(xiang)(xiang)(xiang)(xiang)(xiang)對(dui)比(bi)較(jiao)低的(de)(de)(de)鐵(tie)(tie)(tie)(tie)素(su)(su)(su)(su)體(ti)(ti)(ti)(ti)α相(xiang)(xiang)(xiang)(xiang)(xiang)中(zhong)(zhong)(zhong)產(chan)生。


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2. 交流阻抗測(ce)試分析(xi)


  1000℃、1050℃、1100℃、1150℃及(ji)1200℃固(gu)(gu)溶(rong)(rong)(rong)態的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)2507 雙相(xiang)(xiang)(xiang)(xiang)(xiang)不(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)30℃下于3.5%NaCl溶(rong)(rong)(rong)液(ye)(ye)中(zhong)(zhong)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)Nyquist 圖(tu)如(ru)圖(tu)5.5所(suo)(suo)示，從(cong)圖(tu)中(zhong)(zhong)可以很(hen)明(ming)顯看(kan)出隨(sui)固(gu)(gu)溶(rong)(rong)(rong)熱(re)(re)處理(li)溫(wen)度(du)(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)增高(gao)(gao)(gao)容(rong)(rong)(rong)(rong)抗(kang)(kang)(kang)(kang)弧(hu)(hu)半(ban)(ban)徑先增大(da)后減(jian)小(xiao)(xiao)(xiao)，1050℃時(shi)容(rong)(rong)(rong)(rong)抗(kang)(kang)(kang)(kang)弧(hu)(hu)半(ban)(ban)徑最(zui)大(da)。通常情況下界(jie)面(mian)間(jian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷(he)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)遷移促進了高(gao)(gao)(gao)頻區容(rong)(rong)(rong)(rong)抗(kang)(kang)(kang)(kang)弧(hu)(hu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)形成，容(rong)(rong)(rong)(rong)抗(kang)(kang)(kang)(kang)弧(hu)(hu)與雙電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)層(ceng)容(rong)(rong)(rong)(rong)抗(kang)(kang)(kang)(kang)及(ji)金(jin)屬(shu)(shu)(shu)材料溶(rong)(rong)(rong)解(jie)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)綜合作用有關，并且金(jin)屬(shu)(shu)(shu)－溶(rong)(rong)(rong)液(ye)(ye)界(jie)面(mian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷(he)轉(zhuan)移電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)影響著容(rong)(rong)(rong)(rong)抗(kang)(kang)(kang)(kang)弧(hu)(hu)半(ban)(ban)徑的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)大(da)小(xiao)(xiao)(xiao)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷(he)在金(jin)屬(shu)(shu)(shu)－溶(rong)(rong)(rong)液(ye)(ye)界(jie)面(mian)轉(zhuan)移時(shi)受到的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)阻(zu)(zu)(zu)力越(yue)(yue)強(qiang)(qiang)意味著容(rong)(rong)(rong)(rong)抗(kang)(kang)(kang)(kang)弧(hu)(hu)半(ban)(ban)徑越(yue)(yue)大(da)，即意味著金(jin)屬(shu)(shu)(shu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)抗(kang)(kang)(kang)(kang)蝕(shi)(shi)(shi)性(xing)(xing)能(neng)(neng)(neng)越(yue)(yue)優(you)。從(cong)圖(tu)5.5容(rong)(rong)(rong)(rong)抗(kang)(kang)(kang)(kang)弧(hu)(hu)半(ban)(ban)徑的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)改變趨勢可知，固(gu)(gu)溶(rong)(rong)(rong)熱(re)(re)處理(li)溫(wen)度(du)(du)升(sheng)(sheng)高(gao)(gao)(gao)使(shi)DSS2507的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)耐(nai)蝕(shi)(shi)(shi)性(xing)(xing)能(neng)(neng)(neng)首(shou)先增強(qiang)(qiang)而后減(jian)弱，1050℃時(shi)2507雙相(xiang)(xiang)(xiang)(xiang)(xiang)不(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)抗(kang)(kang)(kang)(kang)腐(fu)(fu)(fu)蝕(shi)(shi)(shi)性(xing)(xing)能(neng)(neng)(neng)最(zui)優(you)。不(bu)同固(gu)(gu)溶(rong)(rong)(rong)態的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)2507雙相(xiang)(xiang)(xiang)(xiang)(xiang)不(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)于3.5%NaCl溶(rong)(rong)(rong)液(ye)(ye)中(zhong)(zhong)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)等效電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路如(ru)圖(tu)5.6所(suo)(suo)示，采(cai)用的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)是R(C(R(CR))).Rs指參比電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)和工(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)間(jian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)溶(rong)(rong)(rong)液(ye)(ye)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)；Cd1為(wei)(wei)雙電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)層(ceng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)；Rct為(wei)(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷(he)轉(zhuan)移電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)，其值(zhi)能(neng)(neng)(neng)夠(gou)反(fan)應(ying)(ying)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷(he)在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)化學反(fan)應(ying)(ying)過程(cheng)中(zhong)(zhong)透(tou)過電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)以及(ji)于電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)解(jie)質(zhi)溶(rong)(rong)(rong)液(ye)(ye)中(zhong)(zhong)兩相(xiang)(xiang)(xiang)(xiang)(xiang)界(jie)面(mian)遷移難易的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)大(da)小(xiao)(xiao)(xiao)，也能(neng)(neng)(neng)夠(gou)反(fan)映金(jin)屬(shu)(shu)(shu)發生腐(fu)(fu)(fu)蝕(shi)(shi)(shi)反(fan)應(ying)(ying)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)快慢(man)，一(yi)般(ban)情況下Rct值(zhi)越(yue)(yue)高(gao)(gao)(gao)意味著電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷(he)遷移過程(cheng)中(zhong)(zhong)所(suo)(suo)受的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)阻(zu)(zu)(zu)力越(yue)(yue)強(qiang)(qiang)，即材料的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)耐(nai)腐(fu)(fu)(fu)蝕(shi)(shi)(shi)性(xing)(xing)能(neng)(neng)(neng)越(yue)(yue)好；Cf表(biao)(biao)(biao)示鈍化膜(mo)(mo)(mo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)，Rf表(biao)(biao)(biao)示鈍化膜(mo)(mo)(mo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)。采(cai)用ZsimpWin軟件對(dui)等效電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路模擬計算得(de)到各元件的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)數值(zhi)如(ru)表(biao)(biao)(biao)5.2所(suo)(suo)列(lie)。從(cong)表(biao)(biao)(biao)中(zhong)(zhong)看(kan)出雙電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)層(ceng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)（Cdl)及(ji)鈍化膜(mo)(mo)(mo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)（Cr)隨(sui)固(gu)(gu)溶(rong)(rong)(rong)溫(wen)度(du)(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)升(sheng)(sheng)高(gao)(gao)(gao)呈先減(jian)小(xiao)(xiao)(xiao)后增大(da)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)趨勢；電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷(he)轉(zhuan)移電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)（Rct)和鈍化膜(mo)(mo)(mo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)（Rf)呈先變大(da)后減(jian)小(xiao)(xiao)(xiao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)趨勢，即電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)化學反(fan)應(ying)(ying)阻(zu)(zu)(zu)力隨(sui)固(gu)(gu)溶(rong)(rong)(rong)熱(re)(re)處理(li)溫(wen)度(du)(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)增高(gao)(gao)(gao)先增強(qiang)(qiang)后減(jian)弱，2507雙相(xiang)(xiang)(xiang)(xiang)(xiang)不(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)抗(kang)(kang)(kang)(kang)腐(fu)(fu)(fu)蝕(shi)(shi)(shi)性(xing)(xing)能(neng)(neng)(neng)表(biao)(biao)(biao)現為(wei)(wei)先增強(qiang)(qiang)后減(jian)弱。1000℃時(shi)鋼(gang)(gang)(gang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)相(xiang)(xiang)(xiang)(xiang)(xiang)界(jie)處有σ相(xiang)(xiang)(xiang)(xiang)(xiang)析出，σ相(xiang)(xiang)(xiang)(xiang)(xiang)硬而脆降低了鋼(gang)(gang)(gang)表(biao)(biao)(biao)面(mian)鈍化膜(mo)(mo)(mo)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)穩定(ding)，表(biao)(biao)(biao)現為(wei)(wei)具有較(jiao)低的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)鈍化膜(mo)(mo)(mo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)（Rf);1050℃時(shi)鋼(gang)(gang)(gang)中(zhong)(zhong)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)兩相(xiang)(xiang)(xiang)(xiang)(xiang)比例約為(wei)(wei)1:1,兩相(xiang)(xiang)(xiang)(xiang)(xiang)分(fen)布較(jiao)均(jun)勻(yun)且成分(fen)穩定(ding)有利(li)于鈍化膜(mo)(mo)(mo)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)穩定(ding)，具體(ti)(ti)表(biao)(biao)(biao)現為(wei)(wei)鈍化膜(mo)(mo)(mo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)（Rf)值(zhi)較(jiao)高(gao)(gao)(gao)，表(biao)(biao)(biao)明(ming)此刻(ke)離子遷移時(shi)所(suo)(suo)受阻(zu)(zu)(zu)力較(jiao)大(da)，進而2507雙相(xiang)(xiang)(xiang)(xiang)(xiang)不(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)抗(kang)(kang)(kang)(kang)腐(fu)(fu)(fu)蝕(shi)(shi)(shi)能(neng)(neng)(neng)力最(zui)佳；固(gu)(gu)溶(rong)(rong)(rong)熱(re)(re)處理(li)溫(wen)度(du)(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)進一(yi)步升(sheng)(sheng)高(gao)(gao)(gao)使(shi)鋼(gang)(gang)(gang)中(zhong)(zhong)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)兩相(xiang)(xiang)(xiang)(xiang)(xiang)比例失調，表(biao)(biao)(biao)現為(wei)(wei)鐵素體(ti)(ti)相(xiang)(xiang)(xiang)(xiang)(xiang)含量大(da)幅升(sheng)(sheng)高(gao)(gao)(gao)，奧氏體(ti)(ti)相(xiang)(xiang)(xiang)(xiang)(xiang)含量減(jian)小(xiao)(xiao)(xiao)，不(bu)利(li)于鋼(gang)(gang)(gang)表(biao)(biao)(biao)面(mian)鈍化膜(mo)(mo)(mo)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)穩定(ding)，導致鈍化膜(mo)(mo)(mo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)（Rf)減(jian)小(xiao)(xiao)(xiao)，實際表(biao)(biao)(biao)現為(wei)(wei)鋼(gang)(gang)(gang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)抗(kang)(kang)(kang)(kang)蝕(shi)(shi)(shi)性(xing)(xing)能(neng)(neng)(neng)下降，這與動電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位掃描獲得(de)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)結論相(xiang)(xiang)(xiang)(xiang)(xiang)同。