Ncha bụ mbibi ma ọ bụ mmebi nke ihe ma ọ bụ ihe onwunwe ha nke gburugburu ebe obibi kpatara. Ọtụtụ nchara na-eme na gburugburu ebe obibi, nke nwere ihe ndị na-emebi emebi na ihe ndị na-emebi emebi dịka oxygen, iru mmiri, mgbanwe okpomọkụ na ihe ndị na-emerụ emerụ.
Njehie Cyclic bụ ihe a na-ahụkarị ma na-emebi ikuku nke ukwuu. Njehie Cyclic Corrosion n'elu ihe ígwè bụ n'ihi ion chloride dị n'elu ígwè nke oyi akwa oxidized na oyi akwa nchebe nke ntinye elu ígwè na mmeghachi omume electrochemical metal dị n'ime nke sitere na ya. N'otu oge ahụ, ion chlorine nwere ike mmiri ụfọdụ, dị mfe ịmịnye na pores nke elu ígwè ahụ, mgbawa jupụtara ma dochie oxygen dị na oyi akwa oxide, oxides na-anaghị agbaze ka ọ bụrụ chlorides na-agbaze, nke mere na ọnọdụ nke elu ahụ ga-abanye n'elu na-arụ ọrụ.
Nnwale Corrosion Cyclic bụ ụdị nnwale gburugburu ebe obibi nke na-eji ngwa ule Cyclic Corrosion emepụta ihe nlereanya arụrụ arụ nke ọnọdụ gburugburu ebe obibi Cyclic Corrosion iji chọpụta nguzogide nchara nke ngwaahịa ma ọ bụ ihe ígwè. E kewara ya ụzọ abụọ, otu maka ule ikpughe gburugburu ebe obibi, nke ọzọ maka ihe nlereanya arụrụ arụ nke ule gburugburu ebe obibi Cyclic Corrosion.
Nnwale gburugburu ebe obibi nke Cyclic Corrosion bụ iji obere ngwa nnwale oghere - ụlọ nnwale Cyclic Corrosion (Foto), n'ogo oghere ya na usoro arụrụ arụ, na-ebute gburugburu Cyclic Corrosion iji nyochaa ogo nke iguzogide corrosion Cyclic Corrosion nke ngwaahịa ahụ.
A na-atụnyere ya na gburugburu ebe obibi, nnu chloride nke gburugburu ebe obibi ya nke Cyclic Corrosion nwere ike ịdị ọtụtụ ugboro ma ọ bụ ọtụtụ ugboro gburugburu ebe obibi okike n'ozuzu ya. Ọnụọgụ mmebi Cyclic Corrosion, nke mere na ọnụego mmebi ahụ na-abawanye nke ukwuu, ule Cyclic Corrosion na ngwaahịa ahụ, oge iji nweta nsonaazụ ahụ na-ebelatakwa nke ukwuu. Dịka ọ dị na gburugburu ebe obibi maka nnwale ngwaahịa, mmebi ya nwere ike were otu afọ, ebe na ihe ngosi arụrụ arụ nke ọnọdụ gburugburu ebe obibi Cyclic Corrosion, ruo awa 24, ị nwere ike nweta nsonaazụ yiri ya.
Enwere ike kewaa mmebi cyclic nke e mere n'ụlọ nyocha ụzọ anọ.
(1)Nnwale Nrụgide Cyclic Neutral (Nnwale NSS)bụ usoro nnwale nchara ngwa ngwa nke pụtara na mbụ ma ugbu a bụ nke a na-ejikarị eme ihe. Ọ na-eji ngwọta saline sodium chloride 5%, uru PH nke edoziri na oke na-anọpụ iche (6.5 ~ 7.2) dị ka ihe ngwọta maka ịgbasa. A na-ewere okpomọkụ ule ahụ 35 ℃, ọnụego nhazi nke ihe achọrọ maka mmebi Cyclic na 1 ~ 2ml/80cm / h.
(2)Nnwale nrụrụ cyclic acid (nnwale ASS)A na-emepụta ya dabere na ule Cyclic Corrosion nke na-anọpụ iche. Ọ bụ itinye ụfọdụ glacial acetic acid na ngwọta sodium chloride 5%, ka uru PH nke ngwọta ahụ wee dị ihe dị ka 3, ngwọta ahụ wee ghọọ acidic, a na-agbanwekwa mmepụta ikpeazụ nke Cyclic Corrosion site na neutral Cyclic Corrosion gaa na acidic. Ọnụego nchara ya dị ihe dị ka ugboro atọ karịa ule NSS.
(3)Nnu ọla kọpa accelerated acetic acid cyclic corrosion test (CASS test)bụ ule nje cyclic corrosion nke mba ọzọ mepụtara ọhụrụ, okpomọkụ nnwale nke 50 ℃, nnu nnu nwere obere nnu ọla kọpa - kọpa chloride, nke nwere nchara siri ike. Oke nchara ya dị ihe dị ka ugboro asatọ karịa nke ule NSS.
(4)Nnwale Nrụgide Cyclic Na-agbanwe agbanwebụ ule zuru oke nke Cyclic Corrosion, nke bụ ule Cyclic Corrosion nke na-anọpụ iche yana ule iru mmiri na okpomọkụ mgbe niile. A na-ejikarị ya eme ihe maka ngwaahịa niile dịka oghere, site na ịbanye na gburugburu ebe obibi mmiri, nke mere na Cyclic Corrosion anaghị emepụta naanị n'elu ngwaahịa ahụ, kamakwa n'ime ngwaahịa ahụ. Ọ bụ ngwaahịa dị na Cyclic Corrosion na okpomọkụ mmiri mmiri abụọ n'ọnọdụ gburugburu ebe obibi, ma mechaa nyochaa njirimara eletriki na igwe nke ngwaahịa ahụ dum ma ọ bụrụ na ọ nwere mgbanwe ma ọ bụ na-enweghị ya.
A na-enye nsonaazụ ule nke ule Cyclic Corrosion n'ụdị njirimara kama n'ụdị ọnụọgụgụ. E nwere ụzọ ikpe anọ a kapịrị ọnụ.
①usoro ikpe ọkwabụ mpaghara nchara na mkpokọta mpaghara nke oke nke pasentị dịka usoro ụfọdụ nkewa n'ime ọtụtụ ọkwa si dị, ruo n'ọkwa ụfọdụ dịka ntọala ikpe ruru eru, ọ dabara adaba maka ihe nlele dị larịị maka nyocha.
②usoro ikpe ịtụleỌ bụ site na ibu nke ihe nlele ahụ tupu na mgbe usoro nyocha nchara gasịrị, gbakọọ ibu nke mfu nke nchara iji chọpụta ogo nke ihe nlele ahụ na-eguzogide nchara, ọ dabara adaba karịsịa maka nyocha mma nke iguzogide nchara ígwè.
③usoro ịchọpụta ọdịdị na-emebi emebibụ usoro mkpebi dị mma, ọ bụ ule Cyclic Corrosion, ma ngwaahịa ahụ ọ na-emepụta ihe na-emebi emebi iji chọpụta ihe nlele ahụ, a na-ejikarị ụkpụrụ ngwaahịa izugbe eme ihe na usoro a.
④usoro nyocha ọnụọgụgụ data corrosionna-enye nhazi nke ule nchara, nyocha nke data nchara, data nchara iji chọpụta ọkwa ntụkwasị obi nke usoro ahụ, nke a na-ejikarị eme nyocha, mmebi ọnụọgụgụ, kama kpọmkwem maka mkpebi àgwà ngwaahịa kpọmkwem.
Nnwale nchara ígwè anaghị agba nchara nke ígwè nchara
E mepụtara ule nrụrụ aka nke Cyclic na mmalite narị afọ nke iri abụọ, ọ bụ ojiji kachasị ogologo nke "ule nrụrụ aka", ihe ndị na-eguzogide nchara nke ukwuu nke ndị ọrụ na-anabata, aghọọla ule "zuru ụwa ọnụ". Isi ihe kpatara ya bụ ndị a: ① na-echekwa oge; ② ọnụ ala dị ala; ③ nwere ike ịnwale ọtụtụ ihe; ④ nsonaazụ ya dị mfe ma doo anya, dị mma maka idozi esemokwu azụmahịa.
N'ọrụ, ule Cyclic Corrosion nke ígwè anaghị agba nchara bụ nke a kacha mara - awa ole ka ihe a nwere ike ịnwale Cyclic Corrosion? Ndị ọkachamara agaghị abụ ndị ọhụrụ n'ajụjụ a.
Ndị na-ere ihe na-ejikarị eme ihepassivationọgwụgwọ ma ọ bụmelite ọkwa nchacha elu, wdg, iji melite oge ule Cyclic Corrosion nke ígwè anaghị agba nchara. Agbanyeghị, ihe kachasị mkpa bụ ihe mejupụtara ígwè anaghị agba nchara n'onwe ya, ya bụ, ọdịnaya nke chromium, molybdenum na nickel.
Ka ọdịnaya nke ihe abụọ ahụ, chromium na molybdenum dị elu, otú ahụ ka arụmọrụ nchara dị mkpa iji guzogide olulu na ire ere dị n'ime oghere na-amalite ịpụta. A na-egosipụta nguzogide nchara a n'ihe a na-akpọ ihe a na-akpọNguzogide Pitting DakọtaraUru (PRE): PRE = %Cr + 3.3 x %Mo.
Ọ bụ ezie na nickel anaghị eme ka ígwè ghara iguzogide olulu na ire ere, ọ nwere ike ibelata ọsọ ire ere nke ọma mgbe usoro ire ere malitere. Ya mere, ígwè anaghị agba nchara nke nwere austenitic nwere nickel na-arụ ọrụ nke ọma na ule ire ere Cyclic, ma na-emebi emebi nke ukwuu karịa ígwè anaghị agba nchara nke nwere obere nickel ferritic nke nwere nguzogide yiri nke ahụ na ihe nhata ire ere pitting.
Ihe Ndị Dị Mkpa: Maka ọkọlọtọ 304, nrụrụ Cyclic na-anọpụ iche na-adịkarị n'etiti awa 48 na 72; maka ọkọlọtọ 316, nrụrụ Cyclic na-anọpụ iche na-adịkarị n'etiti awa 72 na 120.
E kwesịrị ịmara naO nwere ike ịbụ na o meghị ihe ọbụla gbasara ya.Nrụgide okirikiriule ahụ nwere nnukwu nsogbu mgbe a na-anwale ihe onwunwe nke igwe anaghị agba nchara.Ọdịnaya chloride nke Cyclic Corrosion na ule Cyclic Corrosion dị oke elu, karịa gburugburu ebe obibi n'ezie, yabụ ígwè anaghị agba nchara nke nwere ike iguzogide nchara n'ebe a na-etinye ya n'ezie nwere obere ọdịnaya chloride ga-emebikwa na ule Cyclic Corrosion.
Nnwale nchara cyclic na-agbanwe àgwà nchara nke ígwè anaghị agba nchara, a pụghị iwere ya dị ka nnwale ngwa ngwa ma ọ bụ nnwale ihe atụ. Nsonaazụ ya bụ otu akụkụ ma enweghị njikọ yiri ya na arụmọrụ nke ígwè anaghị agba nchara nke ejiri mee ihe n'ikpeazụ.
Ya mere, anyị nwere ike iji ule Cyclic Corrosion tụnyere iguzogide nchara nke ụdị ígwè anaghị agba nchara dị iche iche, mana ule a nwere ike ịnye naanị ọkwa ihe ahụ. Mgbe ị na-ahọrọ ihe ígwè anaghị agba nchara kpọmkwem, ule Cyclic Corrosion naanị anaghị enye ozi zuru oke, n'ihi na anyị enweghị nghọta zuru oke nke njikọ dị n'etiti ọnọdụ nnwale na gburugburu ebe a na-eji ya.
Maka otu ihe ahụ, ọ gaghị ekwe omume ịtụle ndụ ọrụ nke ngwaahịa dabere naanị na nnwale Cyclic Corrosion nke ihe nlele ígwè anaghị agba nchara.
Tinyere nke ahụ, ọ gaghị ekwe omume iji ụdị ígwè dị iche iche tụnyere ya, dịka ọmụmaatụ, anyị enweghị ike iji ígwè anaghị agba nchara tụnyere ígwè carbon a kpụchara akpụ, n'ihi na usoro nchara nke ihe abụọ e ji mee nnwale ahụ dị nnọọ iche, njikọ dị n'etiti nsonaazụ ule ahụ na gburugburu ebe a ga-eji ngwaahịa ahụ eme ihe abụghị otu.
Oge ozi: Nọvemba-06-2023