CN105755459A - Camshaft phosphating technology - Google Patents

Abstract

The invention discloses a camshaft phosphating technology which is characterized by comprising the following steps: 1) a technological process: degreasing, water washing, neutralization and water washing, phosphating, and phosphating post-treatment; 2) technology requirements: (1) degreasing; 3) water washing; 4) neutralization and water washing; 5) phosphating: a preparation method of a phosphating working liquid comprises the steps of adding clear water to the amount of 80% that of a treatment tank, then adding clear water to 1000 L, adding 20 kg of iron powder and iron sheet waste, heating to 90 DEG C, 40 min later, taking out the iron powder, then adding a proper amount of a neutralizing agent NH-4508 to adjust the acidity, confirming the acidity to be a work standard, heating up to a specified temperature, and confirming the total acidity and the free acidity; 6) testing; and 7) phosphating post-treatment: (1) water washing, (2) drying, and (3) antirust oil coating. The phosphating technology is simple in method, the quality of a camshaft after phosphating is good, and the corrosion prevention effect is also relatively good.

Description

A kind of camshaft phosphating process

Technical field

The present invention relates to a kind of camshaft phosphating process.

Background technology

Camshaft is parts in piston engine.Its effect is the unlatching and the closed action that control valve.Although the rotating speed of camshaft is the half (identical with bent axle at the rotating speed of two stroke engine convexity wheel shaft) of bent axle in four-stroke engine, but generally its rotating speed is still significantly high, and need to bear very big moment of torsion, therefore in design, camshaft requirement in intensity and support is significantly high, its material is usually Special Casting Iron, also having once in a while and adopt forging, camshaft has one phosphatization operation in process of production, prevents metal to be corroded after phosphatization to a certain extent；For front bottoming of painting, improve adhesive force and the anti-corrosion capability of paint film layer；Metal cold machining process rises antifriction lubrication use.

Summary of the invention

Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of camshaft phosphating process, and this phosphating process method is simple, and the camshaft quality after phosphatization is good, and anticorrosion ability is also relatively good.

For achieving the above object, the invention provides a kind of camshaft phosphating process, it is characterised in that comprise the steps, 1) technological process: defat → washing → neutralization washing → phosphatization → phosphatization post processing；2) technological requirement: (1) defat: the preparation of ungrease treatment liquid: first add water to 8 one-tenth for the treatment of trough, when heating is about to 40 DEG C, is slowly added 20～50kg degreasing agent MD-130, dissolves while stirring；The water being subsequently adding surplus to 1000L and is stirred；Ungrease treatment liquid is heated to the temperature of regulation, then confirms free alkalinity；3) washing: adopt liquid ejecting method to wash；Rinse bath should have overflow mechanism, constantly flows renewal to keep cleaning water, makes water impurities less than allowed band；The basicity cleaning water should be kept lower than 1.5 points；

4) washing is neutralized；

5) phosphatization: the compound method of phosphatization working solution: first clear water is added to 8 one-tenth in treatment trough, then adds clear water to 1000L, and adds iron powder and jacks 20kg；Heating, to 90 DEG C, takes out iron powder after 40min, then adds appropriate nertralizer NH-4508 and be adjusted acidity, confirms to working standard；It is warmed to the temperature of defined, and confirms total acidity and free acidity；6) inspection: 1. free acidity: pipette 10mL bonderizing working solution in conical flask, adding 50mL distilled water by pipette, adds 2～3 methyl oranges or bromophenol blue indicator, is titrated to 0.1NNaOH and is changed into orange-yellow or bluish violet and is terminal；2. total acidity: pipetting 10mL bonderizing working solution in conical flask, adding 50ml distilled water, add 5～6 phenolphthalein indicators, use 0.1NNaOH titration with suction pipe, color is terminal from the colourless pink that becomes；7) phosphatization post processing: fully eccysis must remain in chemical drugs and other impurity of phosphating coat after (1) washing camshaft phosphatization, in order to avoid causing the corrosion of camshaft；Water temperature should at 21～49 DEG C, and water temperature over-high there is a possibility that the chemical drugs of remaining sticks on phosphating coat, makes phosphating coat coarse, and outward appearance is turned white, and etch resistant properties reduces；Concrete grammar is, adopts liquid ejecting method to wash, removes impurity；Rinse bath should have overflow mechanism；Clean the use condition of water, keep cleaning acidity of water lower than 1.5 points；(2) dry dry is 1 important step of phosphatization post processing, and dry run can affect the etch resistant properties of phosphating coat, after phosphating coat crystalline portion dehydration, more quite a lot of than etch resistant properties time just dry；Method particularly includes: dry up piece surface moisture with warm braw；(3) it is coated with antirust oil.

The invention has the beneficial effects as follows: the phosphating process method of the present invention is simple, and the camshaft quality after phosphatization is good, and anticorrosion ability is also relatively good.

Detailed description of the invention

Technical scheme disclosed by the invention is a kind of camshaft phosphating process, it is characterised in that comprise the steps, 1) technological process: defat → washing → neutralization washing → phosphatization → phosphatization post processing；2) technological requirement: (1) defat: the preparation of ungrease treatment liquid: first add water to 8 one-tenth for the treatment of trough, when heating is about to 40 DEG C, is slowly added 20～50kg degreasing agent MD-130, dissolves while stirring；The water being subsequently adding surplus to 1000L and is stirred；Ungrease treatment liquid is heated to the temperature of regulation, then confirms free alkalinity；3) washing: adopt liquid ejecting method to wash；Rinse bath should have overflow mechanism, constantly flows renewal to keep cleaning water, makes water impurities less than allowed band；The basicity cleaning water should be kept lower than 1.5 points；

4) washing is neutralized；

5) phosphatization: the compound method of phosphatization working solution: first clear water is added to 8 one-tenth in treatment trough, then adds clear water to 1000L, and adds iron powder and jacks 20kg；Heating, to 90 DEG C, takes out iron powder after 40min, then adds appropriate nertralizer NH-4508 and be adjusted acidity, confirms to working standard；It is warmed to the temperature of defined, and confirms total acidity and free acidity；6) inspection: 1. free acidity: pipette 10mL bonderizing working solution in conical flask, adding 50mL distilled water by pipette, adds 2～3 methyl oranges or bromophenol blue indicator, is titrated to 0.1NNaOH and is changed into orange-yellow or bluish violet and is terminal；2. total acidity: pipetting 10mL bonderizing working solution in conical flask, adding 50ml distilled water, add 5～6 phenolphthalein indicators, use 0.1NNaOH titration with suction pipe, color is terminal from the colourless pink that becomes；7) phosphatization post processing: fully eccysis must remain in chemical drugs and other impurity of phosphating coat after (1) washing camshaft phosphatization, in order to avoid causing the corrosion of camshaft；Water temperature should at 21～49 DEG C, and water temperature over-high there is a possibility that the chemical drugs of remaining sticks on phosphating coat, makes phosphating coat coarse, and outward appearance is turned white, and etch resistant properties reduces；Concrete grammar is, adopts liquid ejecting method to wash, removes impurity；Rinse bath should have overflow mechanism；Clean the use condition of water, keep cleaning acidity of water lower than 1.5 points；(2) dry dry is 1 important step of phosphatization post processing, and dry run can affect the etch resistant properties of phosphating coat, after phosphating coat crystalline portion dehydration, more quite a lot of than etch resistant properties time just dry；Method particularly includes: dry up piece surface moisture (temperature 100～130 DEG C) with warm braw；(3) it is coated with antirust oil.

This phosphating process method is simple, and the camshaft quality after phosphatization is good, and anticorrosion ability is also relatively good.

The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (1)

1. a camshaft phosphating process, it is characterised in that comprise the steps, 1) technological process: defat → washing → neutralization washing → phosphatization → phosphatization post processing；2) technological requirement: (1) defat: the preparation of ungrease treatment liquid: first add water to 8 one-tenth for the treatment of trough, when heating is about to 40 DEG C, is slowly added 20～50kg degreasing agent MD-130, dissolves while stirring；The water being subsequently adding surplus to 1000L and is stirred；Ungrease treatment liquid is heated to the temperature of regulation, then confirms free alkalinity；3) washing: adopt liquid ejecting method to wash；Rinse bath should have overflow mechanism, constantly flows renewal to keep cleaning water, makes water impurities less than allowed band；The basicity cleaning water should be kept lower than 1.5 points；

4) washing is neutralized；

5) phosphatization: the compound method of phosphatization working solution: first clear water is added to 8 one-tenth in treatment trough, then adds clear water to 1000L, and adds iron powder and jacks 20kg；Heating, to 90 DEG C, takes out iron powder after 40min, then adds appropriate nertralizer NH-4508 and be adjusted acidity, confirms to working standard；It is warmed to the temperature of defined, and confirms total acidity and free acidity；6) inspection: 1. free acidity: pipette 10mL bonderizing working solution in conical flask, adding 50mL distilled water by pipette, adds 2～3 methyl oranges or bromophenol blue indicator, is titrated to 0.1NNaOH and is changed into orange-yellow or bluish violet and is terminal；2. total acidity: pipetting 10mL bonderizing working solution in conical flask, adding 50ml distilled water, add 5～6 phenolphthalein indicators, use 0.1NNaOH titration with suction pipe, color is terminal from the colourless pink that becomes；7) phosphatization post processing: fully eccysis must remain in chemical drugs and other impurity of phosphating coat after (1) washing camshaft phosphatization, in order to avoid causing the corrosion of camshaft；Water temperature should at 21～49 DEG C, and water temperature over-high there is a possibility that the chemical drugs of remaining sticks on phosphating coat, makes phosphating coat coarse, and outward appearance is turned white, and etch resistant properties reduces；Concrete grammar is, adopts liquid ejecting method to wash, removes impurity；Rinse bath should have overflow mechanism；Clean the use condition of water, keep cleaning acidity of water lower than 1.5 points；(2) dry dry is 1 important step of phosphatization post processing, and dry run can affect the etch resistant properties of phosphating coat, after phosphating coat crystalline portion dehydration, more quite a lot of than etch resistant properties time just dry；Method particularly includes: dry up piece surface moisture with warm braw；(3) it is coated with antirust oil.