Nguzogide corrosion nke Hastelloy

Hastelloy bụ Ni-Mo alloy nwere obere carbon na silicon ọdịnaya, nke na-ebelata oke mmiri nke carbides na akụkụ ndị ọzọ na weld na mpaghara emetụta okpomọkụ, si otú ahụ na-eme ka weldability dị mma ọbụna na steeti welded. Nguzogide corrosion. Dị ka anyị niile maara, Hastelloy nwere ọmarịcha nguzogide corrosion dị iche iche na-ebelata mgbasa ozi, ma nwee ike iguzogide corrosion nke hydrochloric acid na okpomọkụ ọ bụla na itinye uche ọ bụla n'okpuru nrụgide nkịtị. Ọ nwere ezigbo nguzogide corrosion na ọkara-ịta sulfuric acid na-abụghị oxidizing, ọkwa dị iche iche nke phosphoric acid, acetic acid dị elu, formic acid na acid acid ndị ọzọ, bromic acid na hydrogen chloride gas. N'otu oge ahụ, ọ na-eguzogidekwa corrosion site na halogen catalysts. Ya mere, a na-ejikarị Hastelloy mee ihe n'ụdị mmanụ ọkụ na usoro kemịkalụ dị iche iche, dị ka distillation na ntinye nke hydrochloric acid; alkylation nke ethylbenzene na obere nrụgide carbonylation nke acetic acid na usoro mmepụta ndị ọzọ. Otú ọ dị, a chọtara ya na ngwa mmepụta ihe nke Hastelloy ruo ọtụtụ afọ:

(1) Enwere mpaghara mmetụta uche abụọ na Hastelloy alloy nke nwere mmetụta dị ukwuu na nguzogide corrosion intergranular: mpaghara okpomọkụ dị elu nke 1200 ~ 1300 ° C na mpaghara okpomọkụ nke 550 ~ 900 ° C;

(2) N'ihi dendrite nkewa nke weld metal na okpomọkụ metụtara mpaghara nke Hastelloy alloy, intermetallic phases na carbides na-asọpụta n'akụkụ oke ọka, na-eme ka ha nwekwuo mmetụta na corrosion intergranular;

(3) Hastelloy nwere nkwụsi ike na-ekpo ọkụ na-adịghị mma na okpomọkụ. Mgbe ọdịnaya ígwè dị na alloy Hastelloy dara n'okpuru 2%, alloy na-enwe mmetụta maka mgbanwe nke usoro β (ya bụ, usoro Ni4Mo, ihe ntinye intermetallic nyere iwu). Mgbe alloy na-anọ na ọnọdụ okpomọkụ nke 650 ~ 750 ℃ ​​maka ntakịrị oge, a na-emepụta usoro β ozugbo. Ịdị adị nke oge β na-ebelata ike nke Hastelloy alloy, na-eme ka ọ na-enwe mmetụta maka corrosion nrụgide, na ọbụna na-akpata Hastelloy alloy N'ozuzu okpomọkụ ọgwụgwọ) na Hastelloy akụrụngwa cracking na ọrụ gburugburu ebe obibi. Ka ọ dị ugbu a, usoro nnwale ọkọlọtọ maka nguzogide corrosion intergranular nke Hastelloy alloys nke obodo m na mba ndị ọzọ n'ụwa họpụtara bụ usoro nrụgide siri ike na-esi mmiri hydrochloric acid, na usoro nyocha bụ usoro mbelata ibu. Ebe ọ bụ na Hastelloy bụ alloy na-eguzogide corrosion hydrochloric acid, usoro a na-esi esi mmiri hydrochloric acid anaghị enwe mmetụta nke ukwuu iji nwalee ọdịdị corrosion intergranular nke Hastelloy. Ụlọ ọrụ nyocha sayensị nke ụlọ na-eji usoro hydrochloric acid dị elu na-amụ Hastelloy alloys wee chọpụta na nguzogide corrosion nke Hastelloy alloys na-adabere ọ bụghị nanị na ihe mejupụtara kemịkal ya, kamakwa na usoro nhazi nhazi okpomọkụ ya. Mgbe a na-achịkwa usoro nhazi okpomọkụ nke na-ekwesịghị ekwesị, ọ bụghị nanị na mkpụrụ osisi kristal nke Hastelloy alloys na-eto eto, kamakwa usoro σ na elu Mo ga-agbapụta n'etiti ọka. , oke oke ọka etching omimi nke efere na-enweghị isi na efere nkịtị dị ihe dị ka okpukpu abụọ.