Investigations of Copper Corrosion at Willmar, Minnesota

Transcription

1 Invgon of Copp Cooon W Mnno P 2: Nfon nd Copp Cooon n Houhod Pubng Muphy John T. O Conno nd Tho L. O Conno Squn Spng Sud Houhod Tp: Pofng W Quy Chng nudng Copp Cooon Dung W Sog n Houhod Pubng In h pn udy h pog of opp ooon n houhod pubng y w pofd ung qun png podu. Th podu nvov h qun oon of h 25 quo fo houhod o budng p. Wh nxng of w ou pogvy h podu povd ngh no: h quny (uuy 2-5 ) nd quy of w whn h (hd) houhod pubng y h quny nd quy of w n h v onnon o h ho nd h quy of w n h dbuon n po o nng h ho. A pnv nub of h qun p noy nyzd fo: pu (Gny w n h ho; oo n h v onnon nd n.) o b (C oun y b xpony hgh n h houhod pubng nd pogvy ow n h v onnon nd n.) dnfn du (Wh fquny ow o bn n h houhod pubng du gny p n h v onnon nd n.) dovd oxygn (Wh gny pn n h n oxygn y b pogvy dpd n h houhod pubng n popoon o h pod of og nd h vy of nfyng b.) onu on (Aonu on y b dpd n houhod pubng n popoon o h oxygn dpon ud by b nfon.) Th unqu fu of h pn qun png pog h un of opp. Th d hown n Fgu 1 fo h Muphy dn n h Souhw n pn ky h f uh op pnon of h w quy n houhod pubng y. Fgu 1 nd d duon n h oun of oxygn n houhod pubng h w pog fo h p wh oxygn w dpd o 4.5 g O o h n (wh 11.5 g O). Th duon of onu on fo 2.2 (n) o.5 g N (p) onn wh h ohoy fo ob nfon. On of h pnp on ob vy fd n houhod pubng y o h uf povdd by d ppng. A hgh o of uf o od w vou n h pon fo h uuon of dn ogn nd ob gowh (boog f o ). In on wh h hond w h hd dung gn pdy onu dnfn du whh d b gowh. Fgu 1 u h phnon. Wh hon xd 2 g C n h n vuy bn h p nd n h f h whdwn fo h houhod pubng dung h qun png. Sy h onnon of opp ppoxy 1.5 g Cu gny xdng h opp on v n h f h of h Muphy houhod pubng y. d on h pof vdn h boh oby-dd nfon nd opp ooon oung unouy whn h dn pubng y.

2 Th u of udy gvn on Fgu 2 fo nwy onud hou. Ahough onu on onnon h ow h vdn of nfon whn h pubng y f. Aonu on n n-onn.25 o.3 g N n boh h pubng nd h fuhng fo h dbuon n. Copp onnon n h houhod pubng wh vb ow vgng.25 g Cu. Chon nd dovd oxygn w bn houghou h png. Fo h u pp h xnv opp ooon dd no ou dy n h nw opp pp bu y dvop ov pod of. In ddon h d vby of h oxdzng gn hon nd oxygn ky dd h of opp ooon. Ahough o d n op h u of n y udy of h pubng y h Souh (E) Sub- Son pnd n Fgu 3 how h gnfn dpon of oxygn whh ou vn bfo w n h Sub-Son. Oxygn n fnhd w vng h Souhw W Tn Pn w vgng 11 g O wh ppoxy 3 g O vd h Sub-Son. Th u nd h gnfn oxygn dpon du o nfon k p n h dbuon y n vn ow w pu. Whn h Sub-Son pubng ph w found o hv dnd fo 8.1 h Souhw Pn o 7.. Th ff u of ob nfon n onbu gnfny o h obvd of opp ooon. To C Coun nd Hooph P Coun n W W Tn Pn Fnhd W Dbuon Sy Sp nd Houhod Pubng Sy Rov of by Tn Thoughou h udy p w kn fo oop ny fo o b oun. Th n ny hnqu whh povd d whh nw o o w u. Whou pn w p dy fd hough.2 µ bn f o n b nd g p. Th bn hn nd wh fuooho dn ong nd xnd und oop. Th pd podu ow fo d p dnfon nd h nuon of o b by d oop oun. In h W w w ou h fw p oh hn hn b. A hown on h opnyng Fgu 4 h nub of b n h w w (w) ngd fo 562 o 142 vgng bou 1. Th oun yp of ny Mdwn gound w whh no ny hv ud. Sn o of h ogn no uub on p oun d h w ypy xhb ow hooph p oun (HPC). Th py u of W y whh w found o onn o no uub (HPC) ogn h n h w w ou o h dbuon y. To b popuon hown n Fgu 4 h hn bng dud by fon gny nd dung n. An xpon w obvd on Mh whn gnfn duon n oun w obvd h Souhw Pn. Fo h n obvon pp h h nng h n pn wh h ou w w nng n nub dung n nd nng h dbuon y. n Houhod Pubng In onjunon wh h udy of nfon nd opp ooon n h houhod pubng y of Muphy ho p w o od fo o b oun. Th u hown n Fgu 5 nd h h w n h n (fuhd) onnd 68 pobby fng h popuon dhgd no h y fo h n pn. Wh h dpon of hon n h houhod pubng bo n on b ovy nd gowh w o. A u b popuon n h f p w p w found o hv o hn doubd o oun hgh 175. So of h y hv bn ud (hd) fo h houhod pubng y pp w. Cup nd h of w obvd oopy. Moov ny w obvd o b dvdng n ndon of v gowh. C gowh ndd by dvon no obvd n h pn of bo dnfn du.

3 Wh o n opp ooon h no bn dfnd h unou pog of b vy h bn obvd n W houhod pubng y. Effvn of Chon Rdu Th pn of hon du xpd o b n n pvnng h gowh of b dung dbuon. Aodngy p w kn fo h dbuon y on wo d. Th u of o b oun pod funon of hon du h oon n Fgu 6 nd 7. Th u how wd ng of hon du n h dbuon y ndng h pd onupon of hon n h n. Wh h Mh 19 png how no gnfn pon of b popuon o hon du h Mh 21 d nd h hgh b popuon w pn whn hon du dnd o.5 g C o. Th ngn of h onnon of hon n h W dbuon y po oubo d. Low dnfn du f h dvopn nd vy of h nfyng ogn whh ng n on nd owng ph. A h hon ong oxdzng gn v o oxygn nd ky nvovd n h d oxdon of opp o upou nd up on. Ongong ud by h Cy h Souhw W Tn Pn vng h hgh hon dog ung n nd opp onnon n opp ppng. To nz hy-ndud opp ooon n houhod pubng nzon of h hon dog ndd. Hooph Pny u nd h dp h dg of nfon kng p houghou h dbuon y h vuy no hooph b vy. Th u upng nd wn fuh nvgon. In o nn h bn of opo nhn h vy of n oogy-dvngd ob popuon. P 3 Ru of Po Pn Coun nd Copp Pp T Loop Sud of h w db h u of n-pn ud ondud ung po pn oun onnng on xhng n gnu vd bon nd p on d. In ddon w pn h u of opp ooon ud uzng pyonud opp pp oop o u ooon n fu- houhod pubng y.

4 12 Fgu 1. Squn Houhod Tp Spng Muphy Rdn 1 g C C Dovd Oxygn Copp NH4+ Chon Tp Mn Squn Sp 25 Aquo Fgu 2. Squn Spng Nw Hou Aonu Ion g.2.15 Copp fuh 25 Aquo NOTES: Chon nd Dovd Oxygn nd o n g houghou h png. W pu w ppoxy 13 C n h houhod pubng; 5 C n h fuhd p (n).

5 Fgu 3. Squn Spng Souh Sub-Son: 6 hou non 13 Mh T C p H O 4. g Squn 25 Sp Nub 4 5 Fgu 4. n SW nd NE Pn Rw nd Fnhd W 3 SW pn w 2 SW pn fnhd 19 M 1996 NE pn w NE pn fnhd 2 M 1996 SW pn w SW pn fnhd 21 M 1996 NE pn w NE pn fnhd 1 22 M 1996 NE pn w NE pn fnhd 23 M 1996 SW pn w SW pn fnhd Fgu 5. In Squn 25 Sp - Muphy' Houhod Pubng Sy #2 #4 #8 #12 #24 #48 fuhd Squn 25 Sp Nub

6 Fgu 6. n Dbuon Sy vu Chon Rdu - 19 Mh C Chon Rdu g C Fgu 7. n W MN Dbuon Sy vu Chon Rdu - 21 Mh Chon Rdu g C