Method for manufacturing a process apparatus and a process apparatus

Patent metadata

Field	Value
Publication number	US-2017191166-A1
Application number	US-201515309504-A
Country	US
Kind code	A1
Filing date	May 11, 2015
Priority date	May 16, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

The invention concerns a method for manufacturing a process apparatus for moving liquid in high temperature liquid immersion under aggressive chemical environment and dynamic stress, wherein the method comprises the step of lining the process apparatus formed of stainless steel with rubber, wherein the method further comprises the step of forming a passivation layer on a surface of the process apparatus in an acid bath prior to lining the process apparatus comprising the passivation layer with rubber. The invention also concerns a process apparatus.

First claim

1 - 15 . (canceled)

16 . A method for manufacturing a process apparatus for moving liquid in high temperature liquid immersion under an aggressive chemical environment and dynamic stress, wherein the process apparatus is an impeller, agitator or mixer, and wherein the method comprises the step of lining a process apparatus formed of stainless steel with rubber, wherein the method comprises:
roughening a surface of the process apparatus to a roughness of at least 10 μm Rz; and forming a passivation layer on the roughened surface of the process apparatus in an acid bath prior to lining the process apparatus comprising the passivation layer with rubber.

17 . The method according to claim 16 , wherein a surface of the process apparatus is roughened by shot peening prior to forming the passivation layer on the roughened surface of the process apparatus.

18 . The method according to claim 16 , wherein a surface of the process apparatus is roughened to a roughness of at least 15 μm Rz, or at least 20 μm Rz, prior to forming the passivation layer on the roughened surface of the process apparatus.

19 . The method according to claim 16 , wherein a primer and/or an adhesive is applied on the passivation layer prior to lining the process apparatus comprising the passivation layer with rubber.

20 . The method according to claim 16 , wherein the acid bath is a nitric acid bath or a citric acid bath.

21 . The method according to claim 16 , wherein the rubber is halobutyl rubber, preferably bromobutyl rubber.

22 . The method according to claim 16 , wherein the stainless steel is super duplex stainless steel.

23 . A process apparatus for moving liquid in high temperature liquid immersion under an aggressive chemical environment and dynamic stress, which is an impeller, agitator or mixer, and wherein the process apparatus is formed of stainless steel, wherein a surface of the process apparatus is roughened to a roughness of at least 10 μm Rz, and the process apparatus comprises a passivation layer on the roughened surface of the stainless steel, and a rubber lining on the passivation layer.

24 . The process apparatus according to claim 23 , wherein the surface of the process apparatus is roughened to a roughness of at least 15 μm Rz, or at least 20 μm Rz.

25 . The process apparatus according to claim 23 , wherein it comprises a layer of a primer and/or a layer of an adhesive between the passivation layer and the rubber lining.

26 . The process apparatus according to claim 23 , wherein the rubber is halobutyl rubber, preferably bromobutyl rubber.

27 . The process apparatus according to claim 23 , wherein the stainless steel is super duplex stainless steel.

28 . The process apparatus according to claim 23 obtainable by the method for manufacturing a process apparatus for moving liquid in high temperature liquid immersion under an aggressive chemical environment and dynamic stress, wherein the process apparatus is an impeller, agitator or mixer, and wherein the method comprises the step of lining a process apparatus formed of stainless steel with rubber, wherein the method comprises:
roughening a surface of the process apparatus to a roughness of at least 10 μm Rz; and forming a passivation layer on the roughened surface of the process apparatus in an acid bath prior to lining the process apparatus comprising the passivation layer with rubber.

29 . The method according to claim 17 , wherein a surface of the process apparatus is roughened to a roughness of at least 15 μm Rz, or at least 20 μm Rz, prior to forming the passivation layer on the roughened surface of the process apparatus.

30 . The method according to claim 17 , wherein a primer and/or an adhesive is applied on the passivation layer prior to lining the process apparatus comprising the passivation layer with rubber.

31 . The method according to claim 18 , wherein a primer and/or an adhesive is applied on the passivation layer prior to lining the process apparatus comprising the passivation layer with rubber.

32 . The method according to claim 17 , wherein the acid bath is a nitric acid bath or a citric acid bath.

33 . The method according to claim 18 , wherein the acid bath is a nitric acid bath or a citric acid bath.

34 . The method according to claim 19 , wherein the acid bath is a nitric acid bath or a citric acid bath.

35 . The method according to claim 17 , wherein the rubber is halobutyl rubber, preferably bromobutyl rubber.

Assignees

• Outotec Finland Oy

Inventors

• Lindgren Mari
• Laihonen Paavo

Classifications

• C23G1/085

  solutions containing HNO3 · CPC title

• C23C22/24

  containing hexavalent chromium compounds · CPC title

• C09J2400/166

  in the pretreated surface to be joined · CPC title

• C09J5/02

  involving pretreatment of the surfaces to be joined · CPC title

• C09J2421/006

  in the substrate · CPC title