Cov npib tsib xee phosphorus alloy txheej ntawm cov hluav taws xob cua sov raj tsis tau qhia txog qhov tseem ceeb passivation sib
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Cov npib tsib xee phosphorus alloy txheej ntawm cov hluav taws xob cua sov raj tsis tau qhia txog qhov tseem ceeb passivation sib
Lub potentiodynamic polarization curves ntawm npib tsib xee phosphorus alloy coatings tom qab kev kho cua sov nyob rau hauv txawv tej yam kev mob raug ntsuas. Daim duab 4 qhia txog cov polarization nkhaus nyob rau hauv peb qhov kub thiab txias sib txawv. Table 2 qhia txog qhov sib thooj electrochemical tsis suav nrog PAR's M352 corrosion electrochemical tsom xam software raws li qhov nkhaus polarization potentiodynamic. Raws li pom nyob rau hauv daim duab 4, tom qab lub sij hawm luv luv kev kho cua sov, cov nickel phosphorus alloy txheej tsis qhia ib tug tseem ceeb passivation sib. Piv nrog rau lub xeev plating, anodic dissolution tam sim no ntawm txheej tom qab kev kho cua sov ua rau muaj kev sib raug zoo ntau dua nrog qhov nce ntawm qhov muaj peev xwm. Daim duab 5 qhia txog kev sib raug zoo ntawm corrosion muaj peev xwm (Ecorr) thiab corrosion tam sim no (Icorr) ntawm nickel phosphorus alloy coatings nrog kub tom qab lub sij hawm luv luv kev kho cua sov. Los ntawm cov txiaj ntsig kev sim no, nws tuaj yeem pom tau tias tom qab kev kho cua sov ntawm 400 degree, lub peev xwm corrosion ntawm cov txheej yuav txo qis nrog lub sij hawm ntev ntawm rwb thaiv tsev, tab sis cov corrosion tam sim no thiab anodic dissolution tam sim no yog ob qho tib si qis dua li cov txheej txheej. . Thaum qhov kub nce mus txog 700 degree, lub peev xwm corrosion ntxiv txo, thaum qhov corrosion tam sim no txo qis; Lub anodic dissolution tam sim no tom qab 10s thiab 30s ntawm kev kho cua sov yog siab dua li ntawm cov txheej li-plated, thiab nws tsuas yog tom qab ncua lub sijhawm kho cua sov (60s) uas cov anodic dissolution tam sim no txo. Ntawm 1000 degree, lub peev xwm corrosion qhia tau tias muaj kev hloov pauv zoo thiab qhov corrosion tam sim no ncav cuag nws qhov tsawg kawg nkaus; Lub anodic dissolution tam sim no tsuas yog qis dua anodic dissolution tam sim no ntawm cov plated txheej tom qab ncua lub sijhawm kho cua sov (60s). Yog vim li cas vim li cas qhov kev txhim kho corrosion tsis zoo nrog qhov nce ntawm kev kho cua sov thiab lub sij hawm yog vim oxidation thiab ib feem crystallization ntawm cov txheej txheej, cov uniformity ntawm cov tshuaj muaj pes tsawg leeg thiab electrochemical uniformity ntawm tus thawj amorphous lub xeev cuam tshuam, ua rau. nyob rau hauv cov tsos ntawm nplej thiab grain ciam teb. Ni3P theem yog ntau anodic thiab muaj peev xwm tsis zoo tivthaiv, yog li nws cov corrosion muaj peev xwm hloov tsis zoo.
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