Hastelloy B: Lalacewa -Vanguard Resistant in Reductive Corrosive Environments

A matsayin nickel{0}}molybdenum{1}}lalata{2}mai jurewa gami, Hastelloy B ya zama mabuɗin abu a masana'antu kamar injiniyan sinadarai da man fetur don sarrafa mahalli masu lalata sosai, godiya ga ƙaƙƙarfan aikin sa a cikin kafofin watsa labarai na acid. Fa'idodinta sun shahara musamman idan aka kwatanta da irin wannan gami.

 

A cikin mahalli mai rage acid kamar hydrochloric acid da dilute sulfuric acid, Hastelloy B's juriyar lalata ba wani abu bane da ya wuce "alama." Ba kamar 316L bakin karfe ba, wanda ke fama da saurin lalata a matsakaici -haɗaɗɗen hydrochloric acid, Hastelloy B na iya aiki da ƙarfi a cikin acid hydrochloric a yanayin zafi ƙasa da digiri 80. Idan aka kwatanta da nickel - chromium gami (misali, Inconel 600) wanda ke mai da hankali kan juriya na iskar oxygen, babban abun ciki na molybdenum (26%-30%) yana samar da wani barga mai ƙarfi, yana tsayayya da yashwar hydrogen ion yadda ya kamata kuma yana magance matsalar lalatawar fim ɗin a cikin acid na ragewa da ke fuskantar na ƙarshe.

 

Hastelloy B kuma ya yi fice a cikin mahalli masu raguwa tare da yawan adadin ion chloride. Yana ƙin ramuka, ɓarna ɓarna, da fashewar damuwa. Idan aka kwatanta da alloys na titanium, waɗanda ke da haɗari ga haɓakar hydrogen a cikin reductive hydrochloric acid, ko Monel alloys, waɗanda ba su da isasshen juriya na lalata a cikin babban -zazzabi, mai girma{3}matsayin hydrochloric acid, Hastelloy B yana ba da kwanciyar hankali na dogon lokaci-. Ko da a cikin matsanancin zafi (200-300 digiri) acid reductive acid ko sulfur{9}mai ɗauke da kafofin watsa labarai{10}}kamar ƙaƙƙarfan yanayi na raka'a na hydrodesulfurization na man fetur{11}}yana kiyaye kyawawan kaddarorin injina da lalata juriya, yana fin juriya na yau da kullun da juriya. nickel{13} chromium-iron gami.

 

Abubuwan fa'idodinsa daban-daban akan sauran maki na Hastelloy sananne ne: a cikin tsantsar reductive hydrochloric acid, yana nuna mafi kyawun juriya na lalata fiye da jerin Hastelloy C (wanda ya yi fice a cikin kafofin watsa labarai masu gauraya) a ƙaramin farashi; a cikin babban acid hydrochloric -, juriyar lalatarsa ​​ya zarce na jerin Hastelloy G, wanda ke mai da hankali kan juriya na sulfuric acid.

 

Daga dakunan gwaje-gwaje zuwa rukunin masana'antu, Hastelloy B, tare da fa'idodin lalata da aka yi niyya{0}, yana fitowa a matsayin "shamaki mai kariya" mai mahimmanci a cikin mahalli masu lalata.