Hydrogen+Embrittlement 氢脆.ppt

* * * * * * * * * * * * * * * r100 - g110 - b125 r148 - g158 - b170 r153 - g000 - b000 r051 - g102 - b153 r095 - g095 - b095 r102 - g153 - b000 r255 - g102 - b000 Page * r255 - g040 - b040 r082 - g140 - b198 r150 - g150 - b150 r120 - g180 - b020 For internal use only / Copyright ? Siemens AG 2010. All rights reserved. r100 - g110 - b125 r148 - g158 - b170 r153 - g000 - b000 r051 - g102 - b153 r095 - g095 - b095 r102 - g153 - b000 r255 - g102 - b000 r255 - g040 - b040 r082 - g140 - b198 r150 - g150 - b150 r120 - g180 - b020 Hydrogen Embrittlement CT RD SQE 12/may/2011 For internal use only / Copyright ? Siemens AG 2010. All rights reserved. * * Hydrogen Embrittlement Agenda Affected Products Hydrogen Embrittlement Cause Schematics Process Control Test Zinc plated spring washers: hydrogen embrittlement Hydrogen embrittlement after zinc plating * Hydrogen embrittlement after zinc plating Hydrogen Embrittlement * Absorption, diffusion of hydrogen zinc zinc anodes galvanic bath fastener H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H2 H2 H2 H2 H2 H2 H2 H2 Hydrogen Embrittlement * Hydrogen embrittlement: delayed fracture H+ preload = tensile stress H2 H+ Hydrogen Embrittlement * Hydrogen embrittlement: delayed fracture preload = tensile stress H+ H2 Hydrogen Embrittlement * Hydrogen embrittlement: delayed fracture H+ preload = tensile stress H2 Hydrogen Embrittlement * Hydrogen embrittlement: delayed fracture H+ preload = tensile stress H2 Hydrogen Embrittlement * Baking/De-gassing zinc fastener H+ H+ H2 Hydrogen De-Embrittlement * Baking/De-gassing zinc fastener H+ H+ H2 Hydrogen De-Embrittlement * Baking/De-gassing zinc fastener H+ H+ H2 Hydrogen De-Embrittlement * Baking/De-gassing zinc fastener H+ H+ H2 Hydrogen De-Embrittlement * Baking/De-gassing zinc fastener H+ H2 Hydrogen De-Embrittlement * Fastener Fabrication Processes, Cold/Hot forging - Thread Rolling - Plating, Electroplating - Note: No chemical reaction for sand blasting and tumbling