{"id":2226,"date":"2021-07-30T09:15:03","date_gmt":"2021-07-30T09:15:03","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2226"},"modified":"2021-07-30T09:15:03","modified_gmt":"2021-07-30T09:15:03","slug":"the-corrosion-prevention-of-above-ground-pipeline","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/vi\/the-corrosion-prevention-of-above-ground-pipeline\/","title":{"rendered":"Ch\u1ed1ng \u0103n m\u00f2n \u0111\u01b0\u1eddng \u1ed1ng tr\u00ean m\u1eb7t \u0111\u1ea5t"},"content":{"rendered":"<p>S\u1ef1 \u0103n m\u00f2n c\u1ee7a <a href=\"https:\/\/www.wldsteel.com\/product\/above-ground-pre-insulated-steel-pipe\/\">\u0111\u01b0\u1eddng \u1ed1ng tr\u00ean m\u1eb7t \u0111\u1ea5t<\/a> \u0111\u01b0\u1ee3c g\u00e2y ra b\u1edfi s\u1ef1 t\u00e1c \u0111\u1ed9ng t\u1ed5ng h\u1ee3p c\u1ee7a c\u00e1c ion \u0103n m\u00f2n (Cl-, S2-), CO2, vi khu\u1ea9n v\u00e0 oxy h\u00f2a tan. Oxy h\u00f2a tan l\u00e0 ch\u1ea5t oxy h\u00f3a m\u1ea1nh, d\u1ec5 oxy h\u00f3a c\u00e1c ion s\u1eaft \u0111\u1ec3 t\u1ea1o th\u00e0nh k\u1ebft t\u1ee7a v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa oxy h\u00f2a tan v\u00e0 t\u1ed1c \u0111\u1ed9 \u0103n m\u00f2n l\u00e0 tuy\u1ebfn t\u00ednh. Vi khu\u1ea9n kh\u1eed sunfat s\u1ebd t\u1ed3n t\u1ea1i trong n\u01b0\u1edbc hydro sunfua kh\u1eed sunfat, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn n\u1ee9t \u1ed1ng do hydro g\u00e2y ra v\u00e0 n\u1ee9t do \u0103n m\u00f2n \u1ee9ng su\u1ea5t, c\u00e1c s\u1ea3n ph\u1ea9m \u0103n m\u00f2n t\u1ea1o ra s\u1eaft sunfua v\u00e0 b\u00e1m d\u00ednh tr\u00ean b\u1ec1 m\u1eb7t th\u00e9p k\u00e9m, d\u1ec5 r\u01a1i ra , l\u00e0 ti\u1ec1m n\u0103ng, v\u00ec c\u1ef1c \u00e2m t\u1ea1o th\u00e0nh m\u1ed9t ma tr\u1eadn th\u00e9p v\u00e0 pin si\u00eau nh\u1ecf ho\u1ea1t \u0111\u1ed9ng, v\u00e0 ti\u1ebfp t\u1ee5c t\u1ea1o ra s\u1ef1 \u0103n m\u00f2n \u0111\u1ed1i v\u1edbi n\u1ec1n th\u00e9p. Vi khu\u1ea9n ho\u1ea1i sinh b\u00e1m v\u00e0o \u0111\u01b0\u1eddng \u1ed1ng v\u00e0 g\u00e2y t\u1eafc ngh\u1ebdn, \u0111\u1ed3ng th\u1eddi t\u1ea1o ra c\u00e1c t\u1ebf b\u00e0o t\u1eadp trung oxy v\u00e0 g\u00e2y \u0103n m\u00f2n \u0111\u01b0\u1eddng \u1ed1ng. H\u1ed7n h\u1ee3p d\u1ea7u-n\u01b0\u1edbc trong \u0111\u01b0\u1eddng \u1ed1ng b\u1ec1 m\u1eb7t c\u00f3 th\u1ec3 \u0111i v\u00e0o b\u1ec3 ch\u1ee9a n\u01b0\u1edbc th\u1ea3i sau khi t\u00e1ch. Do \u0111\u00f3, khi l\u1ef1a ch\u1ecdn c\u00e1c bi\u1ec7n ph\u00e1p ch\u1ed1ng \u0103n m\u00f2n cho \u0111\u01b0\u1eddng \u1ed1ng tr\u00ean m\u1eb7t \u0111\u1ea5t trong c\u00e1c m\u1ecf d\u1ea7u, c\u1ea7n xem x\u00e9t hi\u1ec7u qu\u1ea3 b\u1ea3o v\u1ec7, \u0111\u1ed9 kh\u00f3 thi c\u00f4ng, chi ph\u00ed v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c. M\u1ed9t s\u1ed1 bi\u1ec7n ph\u00e1p ch\u1ed1ng \u0103n m\u00f2n th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho \u0111\u01b0\u1eddng \u1ed1ng d\u1eabn d\u1ea7u tr\u00ean m\u1eb7t \u0111\u1ea5t:<\/p>\n<p>&nbsp;<\/p>\n<h3>l\u1edbp \u00e1o<\/h3>\n<p>C\u00f3 nhi\u1ec1u l\u1edbp ph\u1ee7 ch\u1ed1ng \u0103n m\u00f2n tr\u00ean \u0111\u01b0\u1eddng \u1ed1ng v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a ch\u00fang l\u00e0 kh\u00e1c nhau. Vi\u1ec7c l\u1ef1a ch\u1ecdn l\u1edbp ph\u1ee7 th\u00edch h\u1ee3p c\u00f3 th\u1ec3 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u1ee7a \u0111\u01b0\u1eddng \u1ed1ng m\u1ed9t c\u00e1ch \u0111\u00e1ng k\u1ec3. Theo m\u00f4i tr\u01b0\u1eddng \u0103n m\u00f2n, ph\u01b0\u01a1ng ti\u1ec7n v\u1eadn chuy\u1ec3n v\u00e0 c\u00e1c \u0111i\u1ec1u ki\u1ec7n kh\u00e1c \u0111\u1ec3 ch\u1ecdn l\u1edbp ph\u1ee7 th\u00edch h\u1ee3p. L\u1edbp ph\u1ee7 b\u1ea3o v\u1ec7 b\u00ean ngo\u00e0i l\u00e0 l\u1edbp ch\u1eafn \u0111\u1ea7u ti\u00ean v\u00e0 quan tr\u1ecdng nh\u1ea5t c\u1ee7a \u1ed1ng th\u00e9p tr\u00ean m\u1eb7t \u0111\u1ea5t, ch\u1ee7 y\u1ebfu l\u00e0 l\u1edbp ph\u1ee7 h\u1eefu c\u01a1 v\u00e0 l\u1edbp ph\u1ee7 (ho\u1eb7c l\u1edbp ph\u1ee7) kim lo\u1ea1i. L\u1edbp ph\u1ee7 h\u1eefu c\u01a1 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh nh\u1ef1a epoxy, epoxy phenolic bi\u1ebfn t\u00ednh, nh\u1ef1a \u0111\u01b0\u1eddng, nh\u1ef1a than \u0111\u00e1 v\u00e0 c\u00e1c l\u1edbp ph\u1ee7 kh\u00e1c. K\u1ebft qu\u1ea3 th\u1ef1c nghi\u1ec7m cho th\u1ea5y b\u1ec1 m\u1eb7t l\u1edbp ph\u1ee7 kh\u00f4ng b\u1ecb bong b\u00f3ng khi ng\u00e2m trong n\u01b0\u1edbc mu\u1ed1i v\u00e0 d\u1ea7u, \u0111\u1ed3ng th\u1eddi l\u1edbp ph\u1ee7 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u ki\u1ec3m tra \u0111\u1ed9 b\u00e1m d\u00ednh v\u00e0 \u0111\u1ed9 bong tr\u00f3c API RP 5L2, cho th\u1ea5y l\u1edbp ph\u1ee7 c\u00f3 \u0111\u1ed9 b\u00e1m d\u00ednh t\u1ed1t. L\u1edbp ph\u1ee7 \u0111\u01b0\u1ee3c l\u00e0m n\u00f3ng \u1edf 250oC trong 30 ph\u00fat v\u00e0 sau \u0111\u00f3 l\u00e0m ngu\u1ed9i b\u1eb1ng n\u01b0\u1edbc \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng. B\u1ec1 m\u1eb7t l\u1edbp ph\u1ee7 kh\u00f4ng b\u1ecb bong tr\u00f3c, kh\u00f4ng n\u1ee9t, kh\u00f4ng bong b\u00f3ng, kh\u00f4ng m\u1ea5t \u0111\u1ed9 b\u00e1m d\u00ednh, v.v., t\u1ee9c l\u00e0 l\u1edbp ph\u1ee7 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t t\u1ed1t. Theo ti\u00eau chu\u1ea9n ASTM D522, ASTM D968 v\u00e0 c\u00e1c ti\u00eau chu\u1ea9n kh\u00e1c \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c th\u1eed nghi\u1ec7m u\u1ed1n v\u00e0 m\u00e0i m\u00f2n, l\u1edbp ph\u1ee7 c\u00f2n c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng u\u1ed1n v\u00e0 m\u00e0i m\u00f2n t\u1ed1t.<\/p>\n<p>&nbsp;<\/p>\n<h3>B\u1ea3o v\u1ec7 cat\u1ed1t<\/h3>\n<p>Vi\u1ec7c ph\u1ee7 b\u1ec1 m\u1eb7t b\u00ean trong \u0111\u1ed1i v\u1edbi c\u00e1c \u0111\u01b0\u1eddng \u1ed1ng c\u00f3 \u0111\u01b0\u1eddng k\u00ednh nh\u1ecf l\u00e0 \u0111i\u1ec1u kh\u00f4ng d\u1ec5 d\u00e0ng (\u0111\u01b0\u1eddng k\u00ednh \u1ed1ng nh\u1ecf h\u01a1n 60mm), ngay c\u1ea3 khi l\u1edbp ph\u1ee7 \u0111\u01b0\u1ee3c ho\u00e0n thi\u1ec7n trong nh\u00e0 c\u0169ng kh\u00f3 \u0111\u1ea1t \u0111\u01b0\u1ee3c l\u1ed7 kim 100%. Ngo\u00e0i ra, l\u1edbp ph\u1ee7 t\u01b0\u1eddng b\u00ean trong th\u01b0\u1eddng b\u1ecb m\u00e0i m\u00f2n trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng n\u00ean vi\u1ec7c s\u1eed d\u1ee5ng bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 cat\u1ed1t c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7n t\u01b0\u1ee3ng th\u1ee7ng do \u0103n m\u00f2n m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. B\u1ea3o v\u1ec7 c\u1ef1c d\u01b0\u01a1ng hy sinh l\u00e0 ph\u01b0\u01a1ng ph\u00e1p b\u1ea3o v\u1ec7 cat\u1ed1t s\u1edbm nh\u1ea5t, v\u1eadn h\u00e0nh \u0111\u01a1n gi\u1ea3n v\u00e0 kh\u00f4ng c\u1ea7n ngu\u1ed3n \u0111i\u1ec7n. C\u00e1c v\u1eadt li\u1ec7u l\u00e0m c\u1ef1c d\u01b0\u01a1ng hy sinh th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u1edf Trung Qu\u1ed1c bao g\u1ed3m magie, k\u1ebdm, nh\u00f4m v\u00e0 h\u1ee3p kim c\u1ee7a ch\u00fang.<\/p>\n<p>D\u00f2ng \u0111i\u1ec7n \u0111\u1ea7u ra c\u1ee7a c\u1ef1c d\u01b0\u01a1ng hy sinh ph\u1ee5 thu\u1ed9c v\u00e0o h\u00ecnh d\u1ea1ng v\u00e0 k\u00edch th\u01b0\u1edbc c\u1ee7a n\u00f3. Trong th\u1eed nghi\u1ec7m trong ph\u00f2ng th\u00ed nghi\u1ec7m v\u1ec1 magi\u00ea, k\u1ebdm, m\u1ed9t h\u1ee3p kim nh\u00f4m c\u00f3 kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 cat\u1ed1t (so v\u1edbi \u0111i\u1ec7n c\u1ef1c tham chi\u1ebfu \u0111\u1ed3ng\/\u0111\u1ed3ng sunfat), ba lo\u1ea1i h\u1ee3p kim ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u c\u1ee7a th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt b\u1ea3o v\u1ec7 cat\u1ed1t c\u1ee7a tr\u1ea1m d\u1ea7u kh\u00ed (ti\u1ec1m n\u0103ng b\u1ea3o v\u1ec7 cat\u1ed1t l\u00e0 0,85 V tr\u1edf l\u00ean), trong \u0111\u00f3 hi\u1ec7u qu\u1ea3 b\u1ea3o v\u1ec7 c\u1ef1c d\u01b0\u01a1ng h\u1ee3p kim nh\u00f4m l\u00e0 t\u1ed1t nh\u1ea5t, c\u1ef1c d\u01b0\u01a1ng magie v\u00e0 c\u1ef1c d\u01b0\u01a1ng h\u1ee3p kim k\u1ebdm k\u00e9m h\u01a1n.<\/p>\n<p>&nbsp;<\/p>\n<h3>kh\u1edbp \u0111\u1eb7c bi\u1ec7t<\/h3>\n<p>M\u1ed1i n\u1ed1i \u0111\u1eb7c bi\u1ec7t \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 gi\u1ea3i quy\u1ebft nh\u1eefng h\u01b0 h\u1ecfng \u0111\u1ed1i v\u1edbi l\u1edbp ph\u1ee7 giao di\u1ec7n do h\u00e0n \u1ed1ng sau khi ph\u1ee7. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p bao g\u1ed3m: s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t ch\u1ecbu l\u1eeda v\u00e0 s\u01a1n ph\u1ee7 nhi\u1ec7t \u0111\u1ed9 cao; Ho\u1eb7c s\u1eed d\u1ee5ng m\u1ed9t lo\u1ea1i kh\u1edbp g\u1ed1m c\u00e1ch nhi\u1ec7t \u1edf nhi\u1ec7t \u0111\u1ed9 cao m\u1edbi, c\u00f3 hi\u1ec7u su\u1ea5t c\u00e1ch nhi\u1ec7t v\u00e0 ch\u1ed1ng \u0103n m\u00f2n t\u1ed1t, c\u0169ng nh\u01b0 khi nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i m\u1ea1nh v\u1ec1 hi\u1ec7u su\u1ea5t c\u1ee7a kh\u1ea3 n\u0103ng ch\u1ed1ng n\u1ed5 v\u00e0 ch\u1ed1ng th\u1ea5m, nh\u01b0ng nh\u01b0\u1ee3c \u0111i\u1ec3m l\u00e0 \u0111\u1ed9 b\u1ec1n v\u00e0 \u0111\u1ed9 d\u1ebbo dai k\u00e9m. C\u00e1c th\u1eed nghi\u1ec7m trong ph\u00f2ng th\u00ed nghi\u1ec7m cho th\u1ea5y trong \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i m\u1ea1nh, kh\u1ea3 n\u0103ng ch\u1ed1ng n\u1ee9t v\u00e0 ch\u1ed1ng xuy\u00ean th\u1ea5u c\u1ee7a m\u1ed1i n\u1ed1i c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u. Tuy nhi\u00ean, v\u1edbi ti\u1ec1n \u0111\u1ec1 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 b\u1ec1n v\u00e0 \u0111\u1ed9 d\u1ebbo dai, \u0111\u1ed9 d\u00e0y th\u00e0nh kh\u1edbp qu\u00e1 d\u00e0y v\u00e0 s\u1ef1 thay \u0111\u1ed5i \u0111\u01b0\u1eddng k\u00ednh trong s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn k\u1ebft c\u1ea5u b\u00ecnh th\u01b0\u1eddng c\u1ee7a k\u1ebft c\u1ea5u. <a href=\"https:\/\/www.wldsteel.com\/product\/above-ground-pre-insulated-steel-pipe\/\">\u0111\u01b0\u1eddng \u1ed1ng<\/a>. Vi\u1ec7c s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t ch\u1ecbu l\u1eeda v\u00e0 c\u00e1c m\u1ed1i n\u1ed1i ph\u1ee7 nhi\u1ec7t \u0111\u1ed9 cao c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng \u0111\u1ea7y \u0111\u1ee7 y\u00eau c\u1ea7u s\u1eed d\u1ee5ng.<\/p>\n<h2><strong>\u00a0<\/strong><\/h2>","protected":false},"excerpt":{"rendered":"<p>S\u1ef1 \u0103n m\u00f2n \u0111\u01b0\u1eddng \u1ed1ng tr\u00ean m\u1eb7t \u0111\u1ea5t l\u00e0 do t\u00e1c \u0111\u1ed9ng t\u1ed5ng h\u1ee3p c\u1ee7a c\u00e1c ion \u0103n m\u00f2n (Cl-, S2-), CO2, vi khu\u1ea9n v\u00e0 oxy h\u00f2a tan. Oxy h\u00f2a tan l\u00e0 ch\u1ea5t oxy h\u00f3a m\u1ea1nh, d\u1ec5 oxy h\u00f3a c\u00e1c ion s\u1eaft \u0111\u1ec3 t\u1ea1o th\u00e0nh k\u1ebft t\u1ee7a v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa oxy h\u00f2a tan v\u00e0 t\u1ed1c \u0111\u1ed9 \u0103n m\u00f2n l\u00e0 tuy\u1ebfn t\u00ednh. Vi khu\u1ea9n kh\u1eed sunfat s\u1ebd t\u1ed3n t\u1ea1i [\u2026]<\/p>","protected":false},"author":1,"featured_media":2227,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2226","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/posts\/2226","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/comments?post=2226"}],"version-history":[{"count":1,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/posts\/2226\/revisions"}],"predecessor-version":[{"id":2228,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/posts\/2226\/revisions\/2228"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/media\/2227"}],"wp:attachment":[{"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/media?parent=2226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/categories?post=2226"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/tags?post=2226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}