Kev txheeb xyuas qhov tob thiab cov txheej txheem tiv thaiv cov txheej txheem rau hydrogenlithlement nyob rau hauv high-zog bolts

Hauv kev ua haujlwm ntawm kev siv tshuab engineering, hydrogen embrittlement yog ib thawj qhov kev pheej hmoo rau qhov tsis ua hauj lwmHigh-lub zog bolts,Nrog nws cov phom sij los ntawm kev yaig ntawm cov txheej txheem hlau los ntawm hydrogen atomices los ntawm cov ntsiab lus kev tshawb fawb, muab cov kev ntsuas tsim qauv, kev tiv thaiv kev ua haujlwm rau kev ua lag luam engineering.

Kuv . qhov xwm ntawm hydrogen embrittlement: kev puas tsuaj loj poob ntawm lattice kev nruj tshwm sim los ntawm hydrogen atoms

Hydrogenlement hais txog qhov tshwm sim uas atomic hydrogen moleculates molecules, thiab qhov kawg ua rau brittle fracture {} nws cov yam ntxwv tseem ceeb xws li:

 

Cov me me me me: Hydrogen atoms diffuse los ntawm cov ntxaij kev ntxhov siab thiab cov khoom siv hauv hydrogenary uas muaj lub zog thiab cov qoob loo sib xyaw

Macroscopic kev ua tau zoo: Cov khoom siv elongation poob qis dua los ntawm ib txwm muaj 12%-15%, thiab kev cuam tshuam nyuaj, thiab cuam tshuam kev cuam tshuam zoo li cas tsis muaj kev cuam tshuam yas, thiab kev sib txuam

Ii {. hydrogen embrittlement Kev Kawm Txuj Ci: Kev Ruaj Ntseg Ua Haujlwm thiab Microstructure

Hydrogen embrittlement rhiab yog kom ze rau cov Bolt'sLub zog ua haujlwm thiab kev kho cua sov microstructure, raws li cov ncauj lus kom ntxaws hauv qab no:

 

Ua hauj lwm qib	Raug khoom siv raug	Kev Kho Cua Sov	Kev tsim	Hydrogen embrittlement txoj kev pheej hmoo	Cov ntsiab lus hydrogen tseem ceeb (PPM)	Cov Cwj Pwm
Qeb 4.8	Q235 Tsawg-cov hlau roj	Tsis muaj kev kho cua sov	Ferrite + PETLLITE	Tsawg kawg nkaus	>10	Yuav luag tsis muaj hydrogen embrittlement nyob rau hauv cov txheej txheem ua pa
Qeb 8.8	45 # Cov Hlau Nruab Nrab	Quenching & tempering (840℃quenching + 550 deg℃tempering)	Tempered Sorbitol	Qi	5–8	Possible under extreme pickling (time >30 feeb), qhov tshwm sim<3%
Qeb 10.9	35crmo alloy steel	Quenching & Tempering (860℃quenching + 520 deg℃tempering)	Tempered Martensite	Siab	1.5–3.0	20% -30% kev pheej hmoo ntawm kev ncua qeeb li ntawm 72 teev yog tias uncharged tom qab electrogalvanizing
Qeb 12.9	30Crmnsi Alloy Steel	IsoticMal Quenching (880 Degree Quenching + 260 deg℃tempering)	Tsawg Bainite + Martensite	Tsis tshua muaj neeg	<1.5	High risk of hydrogen content exceeding standards after pickling; fracture risk >40% Thaum tsis tau tso tawm, feem ntau tsis pub dhau 24-48 teev tom qab plating

Iii {. ob ob qho kev sim ua cov tshuab ntawm hydrogen embrittlement nyob rau hauv high-lub zog bolts

1. Pickling for Rust Removal: The Primary Pathway for Hydrogen Invasion (Accounting for >70%)

Cov tshuaj tiv thaiv mechanism thiab cov kev pheej hmoo:

Tshuaj lom neeg:

Cov tshuaj tiv thaiv tseem ceeb (xeb tshem tawm): Feo + 2 hcl → fcl₂ + h₂o

Sab kev tawm tsam (hydrogen evolution): 2ht {{1} → → → → h (atomic hydrogen)

Qhov tseem ceeb kom muaj cov ntsiab lus:

Acid confress: hydrogen evolution nce li 40% thaum hydrochloric acid concentress ntau tshaj 15%; Pom zoo tswj ntawm 10% -12% {4 4}}

Picking kub: hydrogen diffusion tus nqi triples thaum kub tshaj 60 degree; Qhov zoo tshaj plaws kub yog 40-50℃.

Lub sij hawm Pickling: Hydrogen nkag tau nce ntawm 30% rau txhua 10 feeb ntxiv; Lub sij hawm pickling rau qib 10 {{. 9 9 bolts yuav tsum tsawg dua los yog sib npaug li 15 feeb.

Txoj Kev Npaj Txhim Kho: Sivinhibitor pickling(e {. g {}}}}}}, ntxiv urvogen evolutionide kev phiv tshuaj los ntawm 1.2ppm rau<0.5ppm.

{{02. Electrogalvanizing Txheej Txheem: Accelerator rau hydrogen Atom Aggregation

Hydrogen Evolution thiab diffusion:

Elecroliclating cornhode: Zn²⁺ {+ 2 → → → → {→ → → → → → → (hydrogen evololution tus nqi 10% -15%);

Hydrogen Tap Tsim: PLAT Kev Nyuaj Siab Ua rau Lattice distortion, muab cov chaw ua liaj ua teb rau cov chaw ntxhov siab xws li xov kev ntxhov siab xws li xov paj thiab taub hau fillets.

Kev phom sij:

Cov txheej txheem kev kho deg deg	Hydrogen embrittlement txoj kev pheej hmoo	Cov yam ntxwv raug
Electrogalvanizing	Tsis tshua muaj neeg	Tseem ceeb cathode hydrogen evolution; Kev pheej hmoo siab ntawm kev ncua qeeb li ntawm 72 teev yog tias tsis tau muab
Kub-DIP Galvanizing	Mob siab rau siab	High-temperature zinc bath accelerates hydrogen escape, but rapid cooling (>30 Degree / min) ua rau rov ua kom rov ua kev sib sau thiab qeeb qeeb
Dacromet Txheej	Qi	Tsis muaj ib qho txheej txheem pickling, hydrogen nkag<0.5ppm, no special de-hydrogenation required

Iv {. Kev Tiv Thaiv Cov Txheej Txheem: Los ntawm cov txheej txheem kev tshuaj xyuas thiab kev txais

1. Pretreatment theem: Thaiv hydrogen kev ntxeem tau

Xav Ruv Tshem Tawm Cov Txheej Txheem:

RauQib 10.9+ bolts,xub thawjSandblasting(0.8mm Quartz xuab zeb, 0.6PA siab) kom tsis txhob muaj kev xaiv;

Yog tias yuav tsum yog qhov tsim nyog, siv "ob-tank pickling"(Thawj Tank: 10% Hydrochloric acid {{1} g / l inhotoric ua ntej pickling ua ntej pickling rau 10 feeb {{8}

Kev Ua Kom Txhim Kho Kom Zoo: Hloov cov zog acidic acidic acidic activators nrogKev ua tshuab hluav taws xob(tam sim no ceev 0 {{{{. 5A / dm², sijhawm 2 feeb) ua ntej hluav taws xob hluav taws xob.

2.} de-hydrogenation kev kho mob: yuam hydrogen atom khiav dim (tseem ceeb tswj cov txheej txheem)

Txheej txheem tsis:

Lub Sijhawm Rauv nkag: Tsis pub dhau 2 teev tom qab electroplating / txheej (ua ntej hydrogen atoms forms daim ntawv traps);

Tswj kub: 190-200℃(20-30℃(20-30℃hauv qab no lub ntsia liaj qhov rooj qhov kub npau taws kom tsis txhob hardness poob);

Lub Sijhawm Tuav: suav los ntawm cov ntsia liaj qhov rooj nominal (d):

d

M16 tsawg dua lossis sib npaug rau D

d ntau dua lossis sib npaug ntawm M30: 20-24 teev

Lub Hom Phiaj: Hydrogen cov ntsiab lus tsawg dua los yog sib npaug rau 1.} 0ppm (nrhiav los ntawm GB / T 32566 Thermal ua hauj lwm).

Cov cuab yeej xav tau: Siv cov cua kub cov cua sib dhos nrog kev tswj kom sov (txias sib txawv ± 5 degree); lub thawv tiv thaiv kom tsis txhob muaj cov cub tawg .

3.} Kev tshuaj ntsuam zoo: Tsim kom muaj peb-qib pov thawj

Tshuaj Ntsuam Xyuas	Kev Ntsuam Xyuas Txoj Kev	Txais Cov Qauv Txais	Soj ntsuam sijhawm
Hydrogen cov ntsiab lus	Thermal rho tawm (Astm E1447)	Tsawg dua los yog sib npaug rau 1.5ppm (qib 10.9) / tsawg dua lossis sib npaug nrog 1.0ppm (qib 12.9)	Tom qab-hydrogenation
Ncua Txawb	Kev ntsuam xyuas Tensile tas li (GB / T 3098.17)	Withstand 75% kom muaj zog rau 96 teev tsis muaj pob txha	Tiav cov khoom ua tiav (5% batch)
Metallographic qauv	Ntsuas Hluav Taws Xob Tsom Yeeb (SEM)	Tsis muaj hydrogen-inducts nrib pleb ntawm cov ciaj ciam nplej; khaws cia Austenite hauv Martensite<5%	Txheej Txheem Kev Siv Tau (rau ib qho cua sov)
Hardness uniformity	Rockwell Hardness Tester (HRB)	Hardness kev sib txawv nyob rau hauv ib lub ntsia liaj qhov cub tsawg dua los yog sib npaug rau 3hrc	Tom qab kev kho cua sov

{4.} cov khoom siv thiab cov txheej txheem hloov kho tshiab: txo hydrogen clittlement rhiab

Cov Khoom Siv Tsawg-Hydrogenlement: Siv cov hlau nplaum alloy muaj titanium lossis vanadium (e {{{}}}}}}}}}}}}}}}}}

Kev Kho Lwm Hom: Rau kev pheej hmoo siab bolts (qib 12.9), txais yuavNeeg kho tshuab GalvanizinglossisChromium-Dawb Dacromet Txheejkom tsis txhob muaj zog hydrogen evolution hauv electrogalvanizing .

V . Kev Lag Luam Ncaj Ncees: Kev Lag Luam Kev Puas Tsuaj ntawm kev tsis quav ntsej hydrogen embritty

Nyob rau hauv 2019, ib hydrogen embrittlement pob ntawm bolts nyob rau hauv ib tug petrochemical kev tshawb xyuas ntau dua li 50 lab, thiab cov ntsiab lus hydrogenation tau nce mus txog 3.5ppm-deb tshaj Tus qauv txwv. Cov ntaub ntawv no hais txog De-Hydrogenation Kev Kho Mob yog ib qho tsim nyog tus txheej txheem rau kev ua kom muaj kev nyab xeeb rau kev nyab xeeb rau qib {}}High-lub zog bolts; Ib qho kev txiav txim siab ntawm tus nqi yuav ua rau muaj kev puas tsuaj rau .

 

Los ntawm ntau txoj cai xaiv ntawm cov ntaub ntawv xaiv, txheej txheem kev ua kom zoo, kev pheej hmoo ntawm cov kev pheej hmoo siab, kom muaj kev pheej hmoo, ua kom muaj kev phom sij ntawm cov khoom sib txuas ntawm cov khoom siv