82B yog qhov siab - carbon caij nplooj ntoos hlav hlau uas muaj lub zog siab thiab tawv, tab sis nws muaj kev nkag siab zoo rau kev suav nrog, kev sib cais, qhov tsis xws luag, kev ntxhov siab, thiab ib puag ncig. Lub caij nplooj ntoos hlav tsis ua haujlwm feem ntau tsis yog tshwm sim los ntawm ib qho, tab sis yog kev sib koom ua ke ntawm cov khoom siv, kev tsim khoom, thiab kev ua haujlwm. Hnub no peb yuav tham txog theem xya: Kev Kho Ntog Theem.
7.1 Hla Pickling
Teeb meem: High acid concentration, lub sij hawm ntev, los yog tsis txaus corrosion inhibition tswj.
Mechanism: Pickling dissolves nto nplai, tab sis nws kuj yuav corrode cov hlau matrix thiab tsim hydrogen. Tshaj -pickling forms micropits, hauv qab uas dhau los ua cov ntsiab lus kev ntxhov siab.
Qhov tshwm sim:
Hydrogen embrittlement
Nto pitting
Fatigue crack qhov chaw
ncua kev puas tsuaj
7.2 Electroplating Defects
Teeb meem: Kev loj hlob ntawm hydrogen evolution thaum lub sij hawm electroplating, los yog tsis ua dehydrogenation nyob rau hauv lub sij hawm tom qab plating.
Mechanism: Cathodic cov tshuaj tiv thaiv hauv electroplating tsim hydrogen atoms. Tom qab siab - zog 82B absorbs hydrogen, hydrogen enriches nyob rau hauv cov kev ntxhov siab concentration, ua rau nkig tawg.
Qhov tshwm sim:
Kev tawg thaum khaws cia
Sudden puas tom qab installation
Txheej peeling
Corrosion tiv thaiv tsis ua hauj lwm
7.3 Tsis txaus lossis ntau dhau txhaj tshuaj Peening
Teeb meem: Tsis txaus txhaj tshuaj peening siv, tsis txaus kev pab them nqi, los yog siv cov tawg ntse hlau txhaj tshuaj.
Mechanism: Kev txhaj tshuaj zoo peening tuaj yeem tsim cov kev ntxhov siab nyob rau hauv txheej txheej, inhibiting qhov pib ntawm qaug zog tawg. Yog tias qhov kev siv tsis txaus, qhov ua kom muaj zog tsis txaus; yog tias nws muaj zog heev los yog cov hlau txhaj tshuaj tawg, nws yuav ua rau ntog.
Qhov tshwm sim:
Kev qaug zog lub neej tsis txhim kho
Kev puas tsuaj saum npoo
Thaum ntxov tawg tsim
Batch lifespan dispersion
7.4 Ntau txheej txheej ci kub
Teeb meem: hmoov txheej los yog ci xim kub yog siab dhau lawm, thiab lub sijhawm tuav ntev dhau lawm.
Mechanism: Thaum qhov kub ntawm qhov ci mus txog los yog siab tshaj qhov kev ntxhov siab -relief tempering kub, cov nyhuv tempering thib ob tshwm sim, txo cov khoom siv zog thiab ua kom muaj kev ntxhov siab.
Qhov tshwm sim:
Caij nplooj ntoos hlav ua mos
Poob lub caij nplooj ntoos hlav quab yuam
Permanent deformation
Tsis txaus load peev
7.5 Chemical Residue
Teeb meem: Kev tu tsis tiav, acidic lossis alkaline residual kua tseem nyob rau ntawm lub caij nplooj ntoos hlav los yog hauv crevices.
Mechanism: Nyob rau hauv cov xwm txheej muaj kev ntxhov siab, cov xov xwm seem yuav txhawb nqa kev txhim kho hauv zos lossis kev ntxhov siab corrosion tawg. Cov kua yog tshwj xeeb tshaj yog nyob rau hauv seem ntawm lub caij nplooj ntoos hlav coils thiab nyob rau hauv kawg coil tiv tauj cheeb tsam.
Qhov tshwm sim:
Localized corrosion
Kev nyuaj siab corrosion cracking
Sudden tawg nyob rau hauv ib lub sij hawm luv luv
Corrosion tiv thaiv txheej tsis ua hauj lwm
