tubo sem costura de a\u00e7o inoxid\u00e1vel<\/a> decapagem e passiva\u00e7\u00e3o<\/strong><\/p>\n(1) Droga de passiva\u00e7\u00e3o de decapagem HNO3 6% \uff5e 25% + HF 0,5% \uff5e 8% (fra\u00e7\u00e3o de volume):<\/p>\n
temperatura 21 \u2103 \uff5e 60 \u2103; tempo conforme necess\u00e1rio; ou droga citrato de am\u00f4nio 5% \uff5e 10% massa molar); temperatura 49 \u2103 \uff5e 71 \u2103; tempo 10min \uff5e 60min.<\/p>\n
(2) Medicamento de tratamento passivo HNO3 20% \uff5e 50% (fra\u00e7\u00e3o de volume):<\/p>\n
temperatura 49 \uff5e 71 \u2103; tempo 10min \uff5e 30min; ou temperatura 2l \uff5e 38 \u2103; tempo 30min \uff5e 60min; ou droga HNO320% \uff5e 50% + Na2Cr207H2O 22% \uff5e 6% (massa molar); temperatura 49 \u2103 \uff5e 54 \u2103; tempo 15min \uff5e 30min; ou temperatura 21 \u2103 \uff5e 38 \u2103; tempo 30min \uff5e 60min.<\/p>\n
(3) Droga de descalcifica\u00e7\u00e3o e passiva\u00e7\u00e3o de decapagem H2SO4 8% \uff5e 11% (fra\u00e7\u00e3o de volume):<\/p>\n
Temperatura 66 \u2103 \uff5e 82 \u2103; 6 polegadas 5 min \uff5e 45 min; HNO3 6% \uff5e 25% + HF 0,5% \uff5e 8% (fra\u00e7\u00e3o de volume); temperatura 21 \u2103 \uff5e 60 \u2103; ou HNO3 15% \uff5e 25% + HF l % \uff5e 8 (fra\u00e7\u00e3o de volume).<\/p>\n
Solu\u00e7\u00e3o de gesso<\/strong><\/p>\n(1) HNO3 25% ~ + 4% HF + 71% condensado (fra\u00e7\u00e3o de volume) e BaSO4, ajuste para espessura. Pasta de passiva\u00e7\u00e3o: 30% HNO3 ou 25% + 1% HNO3 (massa molar) K2Cr2O7 e BaSO4 s\u00e3o ajustados para serem espessos. Aplicar a camada superficial por 5 a 30 minutos, e lavar com \u00e1gua condensada at\u00e9 pH = 7. Para cada m\u00e1quina e equipamento tamb\u00e9m pode ser utilizado um tratamento qu\u00edmico org\u00e2nico de passiva\u00e7\u00e3o por pulveriza\u00e7\u00e3o de per\u00f3xido de hidrog\u00eanio.<\/p>\n
(2) Pasta de passiva\u00e7\u00e3o de decapagem: HNO3 8% \uff5e 14% (como agente de passiva\u00e7\u00e3o); HF 10% \uff5e 15% (como agente corrosivo); sulfato de magn\u00e9sio 2.2% \uff5e 2.7% (como emulsificante) nitrato de magn\u00e9sio 60% \uff5e 70% (como um enchimento para melhorar a ades\u00e3o e hidrofilicidade); polifosfato de s\u00f3dio 2,3% a 2,8% (como um inibidor de corros\u00e3o); \u00e1gua (ajustar a viscosidade).<\/p>\n
M\u00e9todo eletroqu\u00edmico<\/strong><\/p>\nResolva o problema de anodizar o tubo de a\u00e7o inoxid\u00e1vel<\/a> pe\u00e7as aguardando revis\u00e3o e manipulam o potencial potenciost\u00e1tico para realizar o tratamento de anodiza\u00e7\u00e3o, ou use pe\u00e7as de a\u00e7o inoxid\u00e1vel para tubos sem costura como eletrodo negativo primeiro e manipule a diferen\u00e7a potenciost\u00e1tica para realizar o tratamento cat\u00f3dico.<\/p>\nEm seguida, o a\u00e7o do tubo sem costura de a\u00e7o inoxid\u00e1vel foi anodizado, e o potencial potenciost\u00e1tico foi manipulado para realizar o tratamento de anodiza\u00e7\u00e3o, e a diferen\u00e7a potenciost\u00e1tica foi alterada novamente para realizar a passiva\u00e7\u00e3o do a\u00e7o inoxid\u00e1vel. A solu\u00e7\u00e3o eletrol\u00edtica era HNO3.<\/p>\n
Depois disso, as propriedades de revestimento dos tubos sem costura de a\u00e7o inoxid\u00e1vel s\u00e3o melhoradas e a resist\u00eancia \u00e0 corros\u00e3o \u00e9 melhorada ainda mais. A diferen\u00e7a de potencial de limite de corros\u00e3o em fenda (Eb) \u00e9 aumentada em cerca de 1000 mV (em 3% NaCl) e a resist\u00eancia \u00e0 corros\u00e3o uniforme pode ser melhorada em tr\u00eas ordens de magnitude (em 20% -30% H2SO4 a 45 \u00b0 C).<\/p>","protected":false},"featured_media":5634,"template":"","categories":[186],"tags":[],"class_list":["post-5633","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"\n
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