Ụkpụrụ nke pitting corrosion nke igwe anaghị agba nchara na otu esi egbochi pitting corrosion

A na-akpọkwa corrosion pitting corrosion obere oghere, pitting ma ọ bụ pitting.

Ọ bụ ụdị mmebi nke corrosion nke ọtụtụ n'ime elu nkemetal na-emeọ bụghị imebi ma ọ bụ na-emebi emebi nke ukwuu, mana oghere corrosion na-apụta n'ebe ndị dị n'ime ma na-etowanye omimi.Ụfọdụ olulu dị iche iche, ebe ndị ọzọ na-ejikọta ọnụ na-adị ka ala siri ike.Etch oghere nwere ike ịbụ nnukwu ma ọ bụ obere, ma n'ozuzu obere, dị ka e gosiri na ndị na-esonụ ọnụ ọgụgụ dị iche iche pitting olulu cross-ngalaba, na okwu nke size, omimi nke etch oghere bụ n'ozuzu hà ma ọ bụ karịa dayameta nke etch oghere.Pitting bụ otu n'ime ụkpụrụ corrosion kacha emerụ ahụ nke igwe anaghị agba nchara duplex.Oghere oghere na-abụkarị ebe mmalite nke mgbawa nrụrụ nrụrụ na mgbawa ike ọgwụgwụ corrosion.

Ụkpụrụ nke pitting corrosion nke igwe anaghị agba nchara na otu esi egbochi pitting corrosion

Igwe anaghị agba ncharaelu passivation film n'ihi ọnụnọ nke ntụpọ na igwe anaghị agba nchara, inclusions na solutes, dị ka inhomogeneity, nke mere na passivation film bụ ihe na-emebi emebi na ebe ndị a, na a akpan akpan corrosive ngwọta na-adị mfe ibibi, mbibi nke akụkụ nke anode na-aghọ. arụ ọrụ, mpaghara gbara ya gburugburu na-aghọ mpaghara cathode, mpaghara mpaghara nke abụọ dị ntakịrị, njupụta anodic dị ugbu a dị nnọọ ukwuu, ọrụ nke ihe ngwọta na-agba ọsọ, wee ghọọ ọnụ ọgụgụ nke oghere dị ka oghere.

Igwe anaghị agba nchara, yana ọla ndị ọzọ na-adabere na yangafemaka nguzogide corrosion, na ngwọta nwere otu anion (chloride, bromide, hypochlorite, ma ọ bụ ion thiosulfate).Ọ bụrụhaala na ikike corrosion (ma ọ bụ ikike etinyere n'oge polarisation anodic) karịrị ike puru Eb, olulu nwere ike ime.Usoro nke pitting corrosion nke duplex igwe anaghị agba nchara bụ otu ihe ndị ọzọ igwe anaghị agba nchara.

Ọla mesoona mgbasa ozi oxidising, ọnụ ọgụgụ corrosion ya karịa nke mbụ a naghị agwọ ya tupu mbelata dị ukwuu na ihe a maara dị ka passivation metal.Enwere ike iji usoro passivation nke ọma kọwaa echiche ihe nkiri dị mkpa, ya bụ,ngafebụ n'ihi na ọrụ nke metal na oxidising media, ọrụ nke metal elu n'ịwa a dị gịrịgịrị, ok, ọma mkpuchi arụmọrụ, nwere ike siri ike mmasị na metal elu passivation film.Ihe nkiri a n'ime akụkụ dị iche, na-abụkarị ikuku oxygen na ogige ígwè.Ọ na-arụ ọrụ nke metal na corrosion media kpamkpam kewapụrụ site na ọrụ nke igbochi metal na corrosion media na kpọmkwem kọntaktị, nke mere na metal ihu ọma kwụsị dissolving na-etolite a passivated ala iji gbochie mmetụta nke corrosion.

 


Oge nzipu: Dec-27-2023