Uvavanyo lokugoba kunye nokuncamathela kweFBE yomgubo wokwaleka

Ukuncamathela kwe FBE powder ukutyabeka

Umvavanyi we-cupping usetyenziselwa ukumisela ukunamathela kwe-FBE powder coating, kunye ne-Fig.7 ibonisa umgaqo wokuvavanya we-cupping tester. Intloko yokuvavanya i-cupping tester i-spherical, ityhala ngasemva kweepaneli ezigqunyiweyo ukuvavanya ukuba ifilimu eqinisekileyo iyaqhekeka okanye yahlulwe kwi-substrate. I-Fig.8 yisiphumo sovavanyo lwe-cupping ye-epoxy powder coating. Kwakunokubonakala ukuba i-FBE powder coatings engagcwaliswanga nge-CTBN-EP prepolymers ineengqungquthela ezincinci ezibonakalayo (Umfanekiso 8 (1)), kanti iingubo ezifakwe kwi-CTBN-EP prepolymers (Umfanekiso 8 (2-3)) azikho iintanda ezibonakalayo, ezibonisa ukubambelela kakuhle kunye nokuqina.

Ukuxhathisa kwiimvavanyo zokugoba zeFBE powder coatings

Umzobo we-9 ubonisa ukuxhathisa ukugoba iziphumo zovavanyo lweentlobo ezintathu zeFBE yomgubo. Ukuchasana nokugoba i-FBE powder coatings ngaphandle kokuzaliswa kwe-CTBN-EP prepolymers ihluphekile (i-Fig.9 (1)), kwaye i-fign. Xa i-prepolymers ye-CTBN-EP yongezwa kwi-powder coating, ukuchasana nokugoba kwe-FBE powder coatings kuphuculwe kakhulu ngokunyuka komxholo we-CTBN-EP prepolymers (Fig.9 (2-3)), kwaye akukho nto yokungaphumeleli ngokubambisana. , ebonisa ukuxhathisa okuphezulu ukugoba.

Uvavanyo lwesitshizi setyuwa kwiingubo

Ukunganyangeki kwe-corrosion of the coatings kuvandlakanywa ngokubeka iingubo kwi-atmosphere yenkungu yetyuwa eyenziwa ngokutshiza i-5wt% yesisombululo se-NaCl esimanzi kwi-35 ± 2 °C ye-3000 h ngokuhambelana ne-ISO 14655: 1999 inkcazo. Emva kokususwa kwigumbi lenkungu yetyuwa, zonke iisampulu zihlanjululwa ngamanzi adibeneyo ukuze zisuse naziphi na iintsalela, ukubola kwengubo kuyabonwa. Inokubonwa kwi-Fig.10, emva kokuba iingubo zizaliswe nge-CTBNEP prepolymers (Fig.10b), akukho bungqina bokugqwala, kwaye imizekelo ayinayo iholide, ebonisa ukuxhathisa kwe-corrosion of coatings ezaliswe yi-CTBN EP prepolymers. inokuhlangabezana neemfuno zomgangatho.

Ukumelana nokugqwesa kwe-organic coating ngaphandle kweziphene kuxhomekeke ikakhulu kwiipropati zayo zomqobo, oko kukuthi, indlela enciphisa ngayo ukusasazwa komswakama kunye ne-ion eyonakalisayo ngefilimu. Phakathi kweeparamitha ezinegalelo kwiipropati zomqobo kukuhlaselwa kwe-substrate yensimbi ephantsi. Ukugquma kufuphi nommandla ongenanto kudala i-passivating layer kwi-substrate ekhusela ukubola okuqhubekayo. Ke ngoko, inokubamba iiyoni (mhlawumbi i-Cl−) ngokulula ukwenza ipholima edibeneyo.