Ulawulo lwe-stainless steel intergranular corrosion, i-304 stainless steel, i-304 stainless steel rust kunye ne-corrosion kwi-stainless steel intergranular corrosion kwi-10%, kuya kwenza ukuba ukunamathela kweenkozo kwehle, xa kukho uxinzelelo, kube lula kakhulu ukuqhekeka, kushwabane, kwaye kufihlwe, kungabonakali kwimo yayo. Ikwabangelwa zezinye izizathu eziphambili ze-corrosion. I-intergranular corrosion ye-austenitic stainless steel ebangelwa bubuhlwempu ibangelwa kakhulu yimida ye-grain Cr, Cr kunye ne-c easy form chemical compounds, umxholo we-Cr.
1, ukwakheka kweekhemikhali kunye nolwakhiwo lwazo
(1) Umxholo we-C
Umxholo we-C wentsimbi yesiphumo sokugqwala kwe-intergranular yentsimbi engagqwali ye-austenitic yeyona nto iphambili. Kwelinye icala, lawula ngokungqongqo i-c kwaye ugcine umxholo wekhabhoni kwi-base metal nakwi-welding rod kwi-0.08%, kwi-base metal nakwi-welding material yongeza izinto ezizinzileyo ze-Ti, Nb, i-affinity enamandla kunye ne-c, ikhabhoni ngaphambi kokuba i-Cr bind ivele, ivelise i-compound ezinzileyo.
(2) ulwakhiwo lwesigaba esiphindwe kabini
Ulwakhiwo lwesigaba esiphindwe kabini luya kwandisa kakhulu amandla okumelana nokugqwala okuphakathi kwegranular. Kwelinye icala, izinto ezibumba i-ferrite, ezifana ne-chromium, i-silicon, i-aluminium, i-molybdenum, ukwakheka kwe-weld yesakhiwo sesigaba esiphindwe kabini, zidibene kwi-arhente yokwakha ekhethiweyo equlethe izinto zokuwelda ze-ferrite.
2, iteknoloji yokuwelda
(1) ubushushu obukwi-450~850℃ kuluhlu lobushushu, ingakumbi kwi-650°C kulula kakhulu ukuveliswa kwindawo yobushushu enobungozi bokugqwala (ekwaziwa ngokuba yindawo enobushushu obuphantsi). Ukuwelda ngentsimbi engatyiwayo, ii-welds zingathathwa phantsi kwe-laminate, okanye ngqo emanzini angasemva okuphola kwe-weld, ukuze ziphole ngokukhawuleza, ukunciphisa ixesha kuluhlu lobushushu, ziindlela ezisebenzayo zokuphucula ukumelana nokugqwala kwamalungu.
(2) ukonyuka kwamandla omgca wokuwelda, kuya kukhawulezisa ukugqwala kwentsimbi engagqwali ye-austenitic. Ngexesha lenkqubo yokuwelda, ngesantya esiphantsi sombane, isantya esiphezulu sokuwelda, i-short-arc, indlela yokuwelda edlula ngeendlela ezininzi, kwaye kunciphisa ubushushu. Ukufakwa kobushushu obuphantsi, ngendlela yokuvavanya ubushushu ngokukhawuleza ngokwaneleyo ukuze kuthintelwe ukugqwala kwe-intergranular kwindawo echaphazelekileyo bubushushu.
Ixesha lokuthumela: Matshi-12-2018