Corrosion xeem ntawm 2205, 2507, 254SMO, 904L thiab lwm yam steels tshwj xeeb

Corrosion xeem ntawm 2205, 2507, 254SMO, 904L thiab lwm yam steels tshwj xeeb

 

Duplex stainless hlau, hu ua Duplex Stainless Steel (DSS), hais txog stainless hlau nrog ferrite thiab austenite txhua tus accounting txog li 50%. Feem ntau, cov ntsiab lus ntawm theem me me yuav tsum muaj tsawg kawg yog 30%. Cov qib sawv cev tseem ceeb yog 2205 duplex steel (S32205, S31803) thiab 2507 super duplex steel (S32750).

Cov neeg sawv cev tseem ceeb ntawm super stainless hlau yog 254SMO (S31254), 904L (N08904), AL-6XN (N08367) thiab 1.4529 (N08926).

Hais txog qhov teeb meem dual-theem steel corrosion uas cov neeg nyeem tau txhawj xeeb txog "GNEE Steel" (kom ua tiav, muaj peb pawg loj ntawm kev tiv thaiv corrosion rau duplex steel thiab super stainless hlau:

1. Pitting corrosion (tseem ceeb pitting kub CPT, pitting corrosion poob, pitting corrosion muaj peev xwm)

2. Crevice corrosion (tseem ceeb crevice corrosion kub CCT, crevice corrosion poob)

3. Kev ntxhov siab corrosion (boiling magnesium chloride, hydrogen sulfide stress corrosion)

Rau peb hom kev xeb saum toj no, muaj cov kev xeem sib xws hauv tsev thiab txawv teb chaws uas tuaj yeem siv rau kev siv.

Part 1 Pitting Corrosion Test

Duplex steel pitting corrosion test qauv:

ASTM G 48-2011 (2015) Method A Standard Test Methods for Pitting and CreviceCorrosion Resistance of Stainless Steels and Related Alloys by Siv FerricChloride Solution

Test Method rau kev txiav txim siab ntawm Pitting thiab Crevice Corrosion ntawm Stainless Hlau thiab Lwm Yam Alloys Siv Ferric Chloride Solutions

ASTM A923-2014 Method C Standard Test Methods rau Detecting Detrimental Intermetallic Phase inDuplex Austenitic / Ferritic Stainless Steels

Test txoj kev rau ferric chloride corrosion ntawm duplex steels

ASTM A923-2014 Txoj Kev A Duplex Steel Etching Structure Classification Sodium Hydroxide Etching Test

ASTM A923-2014 Charpy Impact Test rau Microstructure Classification ntawm Duplex Steels los ntawm Txoj Kev B

ASTM G5-2014 Kev Ntsuas Kev Ntsuas Tus Txheej Txheem rau Kev Ua Cov Khoom Siv Hluav Taws Xob thiab Potentiodynamic Anodic Polarization Kev Ntsuas

Siv cov qauv ntsuas rau potentiodynamic anodic polarization ntsuas

GB/T 17897-2016 Corrosion ntawm hlau thiab alloys-Corrosion test rau pitting corrosion kuj ntawm stainless hlau nyob rau hauv lub ferric chloridesolution

Corrosion ntawm hlau thiab alloys - Kev sim txoj kev rau pitting corrosion ntawm stainless hlau ferric chloride

(Cov qauv no qhia txog kev npaj cov qauv, cov qauv kev sim, cov cuab yeej ntsuas thiab cov khoom siv, cov txheej txheem xeem, cov txiaj ntsig kev xeem thiab cov ntawv xeem rau ferric chloride pitting corrosion test method ntawm stainless hlau. nyob rau hauv txawv ferric chloride Pitting corrosion kuj nyob rau hauv cov kev daws teeb meem thiab ib puag ncig ntawm qhov sib txawv ntawm qhov kub thiab txias, nrog rau cov kev sim nram qab no: a) Txoj kev A 6% ferric chloride tov; b) Txoj kev B 6% ferric chloride hydrochloric acid tov. Duplex steel thiab Cr-Ni austenitic stainless hlau tau pom zoo. )

GB/T 17899-1999 Txoj kev pitting muaj peev xwm ntsuas rau stainless hlau

Stainless hlau pitting corrosion muaj peev xwm ntsuas txoj kev (tus qauv no qhia txog cov qauv, ntsuas kev daws teeb meem, cov cuab yeej ntsuas thiab cov cuab yeej siv, ntsuas cov xwm txheej thiab cov txheej txheem, ntsuas cov txiaj ntsig thiab cov ntawv tshaj tawm rau stainless hlau pitting peev xwm ntsuas txoj kev. ntsuas stainless hlau hauv Pitting corrosion muaj peev xwm hauv nruab nrab 3.5% sodium chloride tov.)

ASTM G150-99 Kev Ntsuas Tus Txheej Txheem rau Electrochemical CriticalPitting Temperature Testing of Stainless Steels

Cov txheej txheem kev sim rau electrochemical tseem ceeb pitting ntsuas kub ntawm stainless hlau

Part 2 Crevice corrosion test

Duplex steel crevice corrosion test qauv:

ASTM G 48-2011 (2015) Method B Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution

Test Method rau kev txiav txim siab ntawm Pitting thiab Crevice Corrosion ntawm Stainless Hlau thiab Lwm Yam Alloys Siv Ferric Chloride Solutions

GB/T 10127-2002 Stainless hlau--Txoj kev ntawm ferric chloride crevice corrosion test

Stainless hlau ferric chloride crevice corrosion test method (Tus qauv no qhia meej txog qhov ntawm stainless hlau ferric chloride crevice corrosion test method, qauv kev npaj thiab cov yuav tsum tau ua, cov khoom siv ntsuas, ntsuas kev daws teeb meem, ntsuas cov xwm txheej thiab cov txheej txheem, kev ntsuam xyuas cov txiaj ntsig thiab cov ntawv xeem.

Cov qauv no tsim nyog rau kev txiav txim siab corrosion ntawm stainless hlau thiab npib tsib xee-raws li alloys uas muaj chromium nyob rau hauv ferric chloride tov los ntsuam xyuas lawv crevice corrosion kuj. )

Part 3 Stress Corrosion Test

Duplex steel stress corrosion test qauv:

ASTM G30-97 Txuj Kev Xyaum Ua thiab Siv U-Bend Stress-Corrosion Test SpecimensMaking thiab siv U-Bend Stress-Corrosion Test Specimens

GB/T 17898-1999 Test method for stress corrosion of stainless steel in boiling magnesium chloride solution