Ihe kpatara na ihe mgbochi nke pickling corrosion nke 304 igwe anaghị agba nchara flanges

Nkọwa: Onye ahịa zụtara otu flanges igwe anaghị agba nchara 304 n'oge na-adịbeghị anya, nke a ga-atụtụ ma tinye ya tupu ejiri ya. N'ihi ya, afụ pụtara n'elu flanges igwe anaghị agba nchara mgbe etinyere ya na tankị pickling maka ihe karịrị nkeji iri. Mgbe e wepụrụ flanges ma hichaa ya, a chọtara corrosion. Iji chọpụta ihe kpatara mmebi nke flanges igwe anaghị agba nchara, gbochie nsogbu dị mma ịmalite ọzọ, ma belata mfu akụ na ụba. Onye ahịa ahụ kpọrọ anyị òkù ka anyị nyere ya aka na nyocha nlele na nyocha metallographic.

Nke mbụ, ka m webata flange igwe anaghị agba nchara 304. Ọ nwere ezigbo nguzogide corrosion, nguzogide okpomọkụ, yana ihe eji arụ ọrụ dị ala. Ọ na-eguzogide corrosion na ikuku yana acid na-eguzogide ya. A na-eji ya n'ọtụtụ ebe n'ọrụ pipeline mmiri dị ka mmanụ ala na ụlọ ọrụ kemịkalụ. Dị ka akụkụ dị mkpa nke njikọ pipeline, ọ nwere uru nke njikọ dị mfe na iji ya eme ihe, na-ejigide arụmọrụ nke pipeline, na ịkwado nyocha na ngbanwe nke akụkụ ụfọdụ nke pipeline.

Usoro nyocha

1. Lelee ihe mejupụtara kemịkalụ: Nke mbụ, lelee flange mebiri emebi wee jiri spectrometer chọpụta kpọmkwem ihe mejupụtara kemịkal ya. E gosipụtara nsonaazụ ya na foto dị n'okpuru. Tụnyere teknụzụ chọrọ nke 304 igwe anaghị agba nchara kemịkalụ ke ASTMA276-2013,Ọdịnaya Cr dị na kemịkalụ nke flange dara ada dị ala karịa ọkọlọtọ ọkọlọtọ.

2. Nyocha metallographic: Ebibiri ihe nlele akụkụ obe ogologo na saịtị corrosion nke flange dara ada. Mgbe ihichachara, ọ dịghị corrosion ahụghị. A na-ahụ ihe ntinye na-abụghị nke ọla n'okpuru microscope metallographic na ụdị sulfide dị ka 1.5, alumina alumina bụ 0, ụdị nnu acid dị ka 0, na mpaghara spherical oxide dị ka 1.5; E debere ihe nlele ahụ site na ngwọta mmiri ferric chloride hydrochloric acid wee hụ n'okpuru microscope metallographic 100x. Achọpụtara na ọka austenite dị n'ime ihe ahụ enweghị oke nha. A tụlere ọkwa nha ọka dịka GB/T6394-2002 si dị. Enwere ike ịdepụta mpaghara ọka na-enweghị isi dị ka 1.5 yana mpaghara ọka dị mma nwere ike ịde ọkwa 4.0. Site n'ileba anya na microstructure nke corrosion dị nso, enwere ike ịchọta na corrosion na-amalite site na elu igwe, na-elekwasị anya na oke ọka austenite ma gbasaa n'ime ihe. A na-ebibi ókèala ọka dị na mpaghara a site na corrosion, na ike njikọ dị n'etiti ọka ahụ fọrọ nke nta ka ọ bụrụ kpamkpam. Igwe ahụ mebiri emebi na-etolite ọbụna ntụ ntụ, nke a na-ewepụ ngwa ngwa n'elu ihe ahụ.

3. Nyocha zuru oke: Nsonaazụ nke nyocha anụ ahụ na nke kemịkal na-egosi na ọdịnaya Cr dị na kemịkalụ nke flange igwe anaghị agba nchara dị ntakịrị ala karịa ụkpụrụ ọkọlọtọ. Ihe Cr bụ ihe kacha mkpa na-ekpebi nguzogide corrosion nke igwe anaghị agba nchara. Ọ nwere ike meghachi omume na ikuku oxygen na-emepụta Cr oxides, na-akpụ oyi akwa passivation iji gbochie corrosion; ọdịnaya sulfide na-abụghị nke ọla na ihe dị elu, na nchịkọta nke sulfide na mpaghara mpaghara ga-eduga n'ịbelata mkpokọta Cr na mpaghara gbara ya gburugburu, na-eme ka mpaghara Cr-ogbenye, si otú ahụ na-emetụta nguzogide corrosion nke igwe anaghị agba nchara; Na-ekiri ọka nke igwe anaghị agba nchara flange, ọ nwere ike ịhụ na ya ọka size bụ nnọọ ihe na-ezighị ezi, na-ekwekọghị ekwekọ agwakọtara ọka na nzukọ na-adịkarị mfe na-etolite iche na electrode nwere, na-akpata micro-batrị, nke na-eduga na electrochemical corrosion on. elu nke ihe. Mkpụrụ ọka na-esighị ike na nke ọma agwakọta nke flange igwe anaghị agba nchara na-emetụta ya na usoro nrụrụ ọkụ na-arụ ọrụ na-ekpo ọkụ, nke a na-akpata site na nrụrụ ngwa ngwa nke ọka n'oge a na-emepụta. Nyocha nke microstructure nke nrụrụ dị nso nke flange na-egosi na corrosion na-amalite site na flange elu ma gbasaa n'ime ime n'akụkụ oke ọka austenite. Nnukwu microstructure dị elu nke ihe ahụ na-egosi na e nwere usoro nke atọ ndị ọzọ na-agbanye na oke ọka austenite nke ihe. Usoro nke atọ gbakọtara na oke ọka na-adịkarị mfe ime ka chromium depletion na oke ọka, na-eme ka ọdịdị corrosion intergranular ma na-ebelata nguzogide corrosion ya.

Mmechi

Enwere ike nweta nkwubi okwu ndị a site na ihe kpatara pickling corrosion nke 304 igwe anaghị agba nchara flanges:

1. Nkwụsị nke flanges igwe anaghị agba nchara bụ nsonaazụ nke ngwakọta nke ihe dị iche iche, n'etiti nke usoro nke atọ na-ebute na oke ọka nke ihe bụ isi ihe kpatara ọdịda flange. A na-atụ aro ka ị na-achịkwa okpomọkụ ọkụ n'oge na-arụ ọrụ ọkụ, ọ bụghị ịgafe oke okpomọkụ nke usoro nhazi ihe ọkụkụ, na ka ọ dị jụụ ngwa ngwa mgbe ngwọta siri ike iji zere ịnọ na okpomọkụ nke 450 ℃-925 ℃ maka ogologo oge. iji gbochie ọdịda nke akụkụ nke atọ.
2. Mkpụrụ ọka ndị a gwakọtara na ihe ahụ na-adaba na corrosion electrochemical n'elu ihe ahụ, a ga-ejikwa nlezianya na-achịkwa usoro nhazi n'oge usoro nhazi.
3. Ọdịnaya Cr dị ala na ọdịnaya sulfide dị elu na ihe ahụ na-emetụta nguzogide corrosion nke flange ozugbo. Mgbe ị na-ahọrọ ihe, ekwesịrị ịṅa ntị na ịhọrọ ihe ndị nwere àgwà ọla dị ọcha.