晶间腐蚀标准.docx

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1、资料内容仅供您学习参考，如有不当或者侵权，请联系改正或者删除。StandardpracticesforDetectingsusceptibilitytointergranularattackinausteniticstainlesssteels奧氏體不銹鋼晶間腐蝕敏感性標準實驗1.scope1.應用範圍thesepracticescoverthefollowingfivetests:1.2這些實驗包括下列五類:1.1.1parcticsA-oxalicacidetchtestforclassificationof

2、etchstructuresofausteniticstainlesssteels(section3to7,inclusive)1.1.1實驗A——奧氏體不銹鋼草酸浸蝕試驗後的浸蝕組織分類(包括3－7部分1.2thefollowingfactorsgoverntheapplicationofthesepractices:1.2以下因素主導著這類實驗:1.2.1susceptibilitytointergranularattackassociatedwiththeprecipitationofchromiumcar

3、bidesisreadilydetectedinallsixtests.1.2.1晶間腐蝕敏感性同碳鉻化合物的快速析出1.2.2sigmaphaseinwroughtchromium-nickel-molybdenumsteels.Whichmayormaynotbevisibleinthemicrostructure,canresultinhighcorrosionratesonlyinnitricacid.1.2.2在鉻鎳鉬鋼中可見的和不可見的sigma相,只有在硝酸中才會快速腐蝕。资料内容仅供您学习参考，如

4、有不当或者侵权，请联系改正或者删除。1.2.3sigmaphaseintitaniumorcolumbiumstabilizedalloysandcastmolybdenum-bearingstainlessalloys,whichmayormaynotbevisibleinthemicrostructure,canresultinhighcorrosionratesinboththenitricacidandferricsulfate-sulfuricacidsolutions.1.2.3在鈦合金或穩定化合金和

5、鑄造鉬柱狀晶中的sigma相,不论在其顯微組織中可見不可見都會在硝酸和硫化鐵溶液中引起嚴重腐蝕。1.3theoxalicacidetchtestisarapidmethodofidentifying,bysimpleetching,thosespecimensofcertainstainlesssteelgradesthatareessentiallyfreeofsusceptibilitytointergranularattackassociatedwithchromiumcarbideprecipitates

6、.Thesespecimenswillhavelowcorrosionratesincertaincorrosiontestsandthereforecanbeeliminated(screened)fromtestingas”acceptable.”1.3草酸浸蝕試驗是一個快速方法用來使這些本質上晶間腐蝕不敏感的不銹鋼試樣快速析出碳鉻化合物。1.7onlythesestainlesssteelgradesarelistedintableoneforwhichdataontheapplicationoftheox

7、alicacidetchtestandontheirperformanceinvariousquantitativeevaluationtestsareavailable.1.7在表一中列出哪些適合用草酸進行浸蝕試驗及各種數量測試下的性能是有效的。资料内容仅供您学习参考，如有不当或者侵权，请联系改正或者删除。PracticeAoxalicacidetchtestforclassificationofetchstructuresofausteniticstainlesssteels2實驗A——奧氏體不銹鋼草酸浸蝕試

8、驗後的浸蝕組織分類3.1theoxalicacidetchtestisusedforacceptanceofmaterialbutnotforrejectionofmaterial.Thismaybeusedinconnectionwithotherevaluationteststoprovidearapidmethodforidentifyingthosespecime