Surface processing technology of food-grade stainless steel pipe
A stainless steel pipe, surface treatment technology, applied in the direction of metal material coating process, etc., to achieve the effect of improving corrosion resistance and improving finish
Active Publication Date: 2014-08-13
SHANGHAI SHENZHOU YANGGUANG SPECIAL TUBES COLTD SYT +1
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, there is no relevant national standard in our country, and a large number of imported
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0026] 1. Chemical degreasing
[0027] According to the solution containing 50g of sodium hydroxide, 25g of sodium carbonate, 65g of sodium phosphate, 8g of sodium silicate, 8g of active agent (TX-10), 3g of emulsifier (TX-7), and 7g of detergent (6501) in each liter of the solution, take the above The substance is dissolved in water, heated to 40°C, and the steel pipe to be treated is immersed in it for 30 minutes, and the solution is cleaned by circulating stirring during the degreasing process;
[0028] The steel pipe after degreasing is moved into a hot water tank, washed and soaked in hot water at 60°C for 15 minutes, and the saponified matter attached to the surface of the steel pipe after the action of oil and alkali is separated by circulating stirring, so that the surface is cleaned, and then the steel pipe is placed in a clean water tank at room temperature Soak in clean water for 15 minutes, rinse one by one with a high-pressure water gun, and thoroughly remove sapo...
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Abstract
The invention discloses a surface processing technology of a food-grade stainless steel pipe. The surface processing technology comprises the following steps: chemically removing oil, loosing an oxide film through ultrasonic wave, etching to remove the oxide film, activating, chemically polishing, chemically purifying, neutralizing, and dehydrating through ethanol, wherein the steps of passivating and polishing are the key processes for improving the corrosion resistance of the food-grade stainless steel pipe; a special prescription is carried out in each process; and the processes of processing via hot water at a plurality of hot water alternatively cleaning via clean water, dehydrating, and sterilizing so as to form the complete set surface processing technology; and with the adoption of the surface processing technology, the finish of the steel pipe is greatly improved, and the corrosion resistance of the stainless steel pipe is correspondingly improved. The food-grade stainless steel pipe produced by the technology provided by the invention has the roughenss Ra up to 0.13um, and the roughness exceeds the specification requirements of international standard and foreign advanced standard.
Description
technical field [0001] The invention relates to material surface treatment technology, in particular to a surface treatment process for food-grade stainless steel pipes. Background technique [0002] Food-grade stainless steel pipes are widely used in many fields and industries of national economic construction such as pharmaceuticals, food, beer, drinking water, biological engineering, chemical engineering, air purification, aviation, and nuclear industry. The International Organization for Standardization issued ISO 2037 in 1992 The international standard of "Stainless Steel Pipes for Food Industry" requires food-grade stainless steel pipes to meet the requirements of the relevant stainless steel pipe standards for fluid transportation, and requires the inner surface roughness of the steel pipe to be R a ≤1.0μm. Subsequently, special standards were promulgated in the United States, the United Kingdom, Germany and other countries, which put forward higher requirements for ...
Claims
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IPC IPC(8): C23C22/40C23G1/19C23G1/08C23C22/78C23C22/82
Inventor 赵江山张培丽何为民
Owner SHANGHAI SHENZHOU YANGGUANG SPECIAL TUBES COLTD SYT