Raws li peb paub, ntawm cov phaj ntawm lub phaj hloov pauv cua sov, titanium phaj yog qhov tshwj xeeb rau nws qhov kev tiv thaiv zoo heev rau corrosion. Thiab hauv kev xaiv ntawm gasket, viton gasket yog nto moo rau kev tiv thaiv acid thiab alkali thiab lwm yam tshuaj lom neeg. Yog li lawv puas tuaj yeem siv ua ke los txhim kho qhov kev tiv thaiv corrosion ntawm lub phaj hloov pauv cua sov?
Qhov tseeb, Titanium phaj thiab viton gasket tsis tuaj yeem siv ua ke. Tab sis vim li cas? Nws yog lub hauv paus ntsiab lus tiv thaiv corrosion ntawm titanium phaj uas ob yam no tsis tuaj yeem siv ua ke, vim tias titanium phaj yooj yim los tsim ib txheej ntawm cov yeeb yaj kiab tiv thaiv titanium oxide ntom ntom ntawm qhov chaw, cov txheej txheem oxide no tuaj yeem tsim sai hauv qhov chaw muaj oxygen tom qab kev puas tsuaj. Thiab qhov no tso cai rau kev puas tsuaj thiab kho (repassivation) ntawm cov yeeb yaj kiab oxide kom khaws cia rau hauv lub xeev ruaj khov, tiv thaiv cov ntsiab lus titanium sab hauv los ntawm kev puas tsuaj ntxiv.
Ib daim duab qhia txog kev xeb ntawm qhov pitting
Txawm li cas los xij, thaum titanium hlau lossis alloy nyob rau hauv ib puag ncig uas muaj fluorine, nyob rau hauv qhov kev ua ntawm hydrogen ions hauv dej, cov fluoride ions los ntawm viton gasket react nrog cov hlau titanium los tsim cov fluoride soluble, uas ua rau titanium pitting. Cov kab zauv tshuaj tiv thaiv yog raws li nram no:
Ti2O3+ 6HF = 2TiF3+ 3H2O
TiO2+ 4HF = TiF4+ 2H2O
TiO2+ 2HF = TiOF2+ H2O
Cov kev tshawb fawb pom tau tias hauv cov kua qaub, thaum cov tshuaj fluoride ion concentration ncav cuag 30ppm, cov zaj duab xis oxidation ntawm titanium nto tuaj yeem raug rhuav tshem, qhia tias txawm tias qhov concentration qis heev ntawm fluoride ion yuav txo qhov corrosion tsis kam ntawm titanium phaj.
Thaum cov hlau titanium tsis muaj kev tiv thaiv ntawm titanium oxide, nyob rau hauv qhov chaw corrosive uas muaj hydrogen ntawm hydrogen evolution, titanium yuav txuas ntxiv nqus hydrogen, thiab REDOX reaction tshwm sim. Tom qab ntawd TiH2 yog tsim rau ntawm qhov chaw ntawm titanium crystal, uas ua rau qhov corrosion ntawm titanium phaj accelerates, tsim cov kab nrib pleb thiab ua rau lub phaj kub exchanger xau.
Yog li ntawd, hauv cov phaj hloov pauv cua sov, titanium phaj thiab viton gasket yuav tsum tsis txhob siv ua ke, txwv tsis pub nws yuav ua rau xeb thiab ua tsis tiav ntawm cov phaj hloov pauv cua sov.
Shanghai Heat Transfer Equipment Co., Ltd. (SHPHE) muaj kev paub nplua nuj hauv kev lag luam phaj kub exchanger, thiab kuj muaj cov chaw soj nstuam lub cev thiab tshuaj lom neeg, uas tuaj yeem txiav txim siab sai thiab meej cov khoom siv ntawm phaj thiab gasket rau cov neeg siv khoom thaum ntxov ntawm kev xaiv, kom ntseeg tau tias kev ua haujlwm zoo thiab txhim khu kev qha ntawm cov khoom siv.
Lub sijhawm tshaj tawm: Lub Ob Hlis-17-2022