| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document Help

Title:Obstojnost protikorozijskih hidrofobnih prevlek pri povišani temperaturi
Authors:ID Lozinšek, Julij (Author)
ID Fuchs Godec, Regina (Mentor) More about this mentor... New window
ID Finšgar, Matjaž (Comentor)
Files:.pdf UN_Lozinsek_Julij_2016.pdf (3,52 MB)
MD5: AAB7E0F5E1E9E226101811E09A1E6438
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Predhodno obdelane jeklene podložke smo potopili v stearinsko kislino z namenom, da bi preverili korozijske inhibicijske lastnosti. Vzorce smo zbrusili, očistili in jih zaščitili s slojem stearinske kisline. Sloj smo tvorili s potopitveno metodo. Korozivno okolje je bila razredčena klorovodikova kislina. Pri poskusih smo spreminjali temperaturo korozivnega okolja v intervalu od 25 °C do 80 °C. Spreminjali smo še čas potopitve vzorcev v stearinski kislini, in sicer smo izvajali 3-urno in 24-urno potopitev. Glavni konstantni parametri so bili koncentracija stearinske kisline, koncentracija klorovodikove kisline in čas potopitve v korozivnem mediju. Pri poskusih smo zasledili določeno odstopanje meritev pri višjih temperaturah, na kar so vplivale nekatere spremenljivke, ki jih nismo predvideli. Te so: – predzgodovina vzorcev; - neenaka kemijska sestava vzorcev; - nepopolnost zaščitnega sloja; - mehanske obremenitve pri izdelavi vzorcev; - povečana kontaktna površina vzorcev. Vse te spremenljivke so predvidoma vplivale na vrednost inhibicijske učinkovitosti. Najvišjo inhibicijo smo pri 3-urni in 24-urni potopitvi v stearinski kislini dobili pri najnižji temperaturi 25 °C. Inhibicija je pri 3-urni in 24-urni potopitvi padala od temperature 25 °C do 40 °C. Pri 24-urni potopitvi smo dosegli višje inhibicije kot pri 3-urni. Nepričakovano se je inhibicijska učinkovitost pri 3-urni in 24-urni potopitvi v območju med 40 °C in 70 °C močno povečala. Eksperimentalno delo prikazuje možnost uporabe nasičenih maščobnih kislin v namene inhibicije korozije kovinskih materialov. Stearinska kislina je nedvomno primerna, saj je ekonomsko ugodna, je dostopna, okolju prijazna in lahko odstranljiva s površine materiala. Izstopajoča slaba lastnost je mehanska neobstojnost. Vsekakor so potrebne nadaljnje raziskave, da bi bolje razumeli vse parametre, ki vplivajo na njene inhibicijske lastnosti. Nadaljnje raziskave bi zagotovo pripomogle k izboljšavam inhibicijskih lastnosti te maščobne kisline.
Keywords:korozijski inhibitorji, protikorozijski surfaktanti, stearinska kislina, korozija, organski inhibitorji
Place of publishing:Maribor
Publisher:[J. Lozinšek]
Year of publishing:2016
PID:20.500.12556/DKUM-60765 New window
UDC:620.193:667.648.2(043.2)
COBISS.SI-ID:20305686 New window
NUK URN:URN:SI:UM:DK:KSNRNORQ
Publication date in DKUM:19.07.2016
Views:1625
Downloads:162
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
:
Copy citation
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:Bookmark and Share


Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Secondary language

Language:English
Title:Stability of anti-corrosion hydrophobic surfactants at elevated temperatures
Abstract:Stearic acid was applied on pretreated steel washers to investigate corrosion inhibition properties. Specimen were grinded, cleaned and protected with a thin layer of stearic acid. Layer was formed with immersion in a solution of stearic acid. The corrosive environment was diluted hydrochloric acid. Temperature of corrosive environment was adjusted in range from 25 °C to 80 °C. Time of adsorption of stearic acid on specimen was also adjusted. We conducted two time variants, shorter 3-hour and longer 24-hour immersion. Main constant parameters were concentration of stearic acid, hydrochloric acid and time of corrosion exposure. Deviation of measurements at higher temperatures was observed during experimental period, this is suspected due to: - prehistory of specimen; - uneven chemical composition of specimen; - imperfections of protective layer; - mechanical stress of manufacture; - increased contact area. Above listed parameters influenced inhibition efficiency. Higher inhibition efficiency was achieved with longer 24-hour immersion. Inhibition efficiency was decreasing from 25 °C to 40 °C and increasing from 40 °C to 70 °C in both 3-hour and 24-hour immersion. This experimental work shows possibility of corrosion protection with saturated fatty acids. Stearic acid is undoubtedly good candidate because it is cheap, accessible, environmentfriendly and easy to remove from surface of the metal. However, further more detailed work is needed to be done to better understand all parameters which affect inhibition properties of stearic acid. Further studies would surely advance inhibition properties and potential use of this fatty acid.
Keywords:corrosion inhibitors, anti-corrosion surfactants, stearic acid, corrosion control, organic surfactants


Comments

Leave comment

You must log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica