Corrosion rates

This function calculates the corrosion rates of a given metal contact surface under a specified solution condition.

This calculation is currently only supported for the AQ thermodynamic framework

corrosion rates

POST https://api.olisystems.com/engine/flash/{dbs_file_id}/corrosion-rates

calculate the corrosion rate

Headers

Name	Type	Description
Authorization	string	Bearer {access_token}
Content-Type	string	application/json

200 Please look at "API call blueprint" page on how to obtain results

{
	"code": 200,
	"data": {
		"file_id": "dee854a6-59db-487d-ad08-a20dee691133",
		"jobId": "f6b3375e-cd0f-4ace-a5ee-71e047b76754",
		"resultsLink": "https://api.olisystems.com/result/flash/f6b3375e-cd0f-4ace-a5ee-71e047b76754?context=engine",
		"status": "IN PROGRESS"
	},
	"message": "Process execution started Successfully",
	"status": "SUCCESS"
}

Request payload

{
    "params": {
        "temperature": {
            "value": 40.0,
            "unit": "°C"
        },
        "pressure": {
            "value": 1.5,
            "unit": "atm"
        },
        "calculationType": "isothermal",
        "inflows": {
            "unit": "mol",
            "values": {
                "H2O": 50.0,
                "NACL": 0.01,
                "HNO3": 1,
                "FEEL": 0.0
            },
            "totalAmount":
            {
                "value": 51.01,
                "unit": "mol"
            }
        },
        "corrosionParameters":
        {
            "contactSurface": "Carbon steel G10100 (generic)",
            "flowType": "static"
        }
}

params	type	description
temperature	valueObject	specified or initial guess temperature with unit
pressure	valueObject	specified or initial guess pressure with unit
calculationType	string	single point flash calculation type of solution, e.g. isothermal

params.calculationType currently only supports the "isothermal" type.

Corrosion parameters

params.corrosionParameters	type	description
contactSurface	string	contact surface metal name, which can be retrieved from Corrosion contact surfaces
flowType	string	flow configuration

Options for flowType

params.corrosionParameters.flowType	description
static	mimics static flow
pipeFlow	mimics pipe flow
rotatingDisk	several parallel disks that are rotating
rotatingCylinder	several parallel cylinders that are rotating
completeAgitation	liquid phase is completely agitated and no mass transfer limitations apply
definedShearStress	define the stress of applied force over material
approximateMultiPhaseFlow	mimics an approximate multi-phase flow

Additional corrosion parameters may be required for different flow types, which are explained as below

Additional parameters if flowType is pipeFlow

{
    "params": {
        ...<snip>...,
        "corrosionParameters":
        {
            "contactSurface": "Carbon steel G10100 (generic)",
            "flowType": "pipeFlow",
            "pipeDiameter": {
                "value": 0.05,
                "unit": "m"
            },
            "pipeFlowVelocity": {
                "value": 6.0,
                "unit": "ft/s"
            }
        },
        ...<snip>...
}

params.corrosionParameters	type	description
pipeDiameter	valueObject	pipe diameter and unit
pipeFlowVelocity	valueObject	pipe flow velocity and unit

Additional parameters if flowType is rotatingDisk

{
    "params": {
        ...<snip>...,
        "corrosionParameters":
        {
            "contactSurface": "Carbon steel G10100 (generic)",
            "flowType": "rotatingDisk",
            "diskDiameter": {
                "value": 0.6,
                "unit": "in"
            },
            "diskRotationSpeed": {
                "value": 15.0,
                "unit": "cycle/s"
            }
        },
        ...<snip>...
}

params.corrosionParameters	type	description
diskDiameter	valueObject	disk diameter and unit
diskRotationSpeed	valueObject	disk rotation speed and unit

Additional parameters if flowType is rotatingCylinder

{
    "params": {
        ...<snip>...,
        "corrosionParameters":
        {
            "contactSurface": "Carbon steel G10100 (generic)",
            "flowType": "rotatingCylinder",
            "rotorDiameter": {
                "value": 5,
                "unit": "mm"
            },
            "rotorRotation": {
                "value": 1000,
                "unit": "cycle/min"
            }
        },
        ...<snip>...
}

params.corrosionParameters	type	description
rotorDiameter	valueObject	rotor diameter and unit
rotorRotation	valueObject	rotor rotation speed and unit

Additional parameters if flowType is definedShearStress

{
    "params": {
        ...<snip>...,
        "corrosionParameters":
        {
            "contactSurface": "Carbon steel G10100 (generic)",
            "flowType": "definedShearStress",
            "shearStress": {
                "value": 0.01,
                "unit": "kPa"
            }
        },
        ...<snip>...
}

params.corrosionParameters	type	description
shearStress	valueObject	shear stress and unit

Additional parameters if flowType is approximateMultiPhaseFlow

{
    "params": {
        ...<snip>...,
        "corrosionParameters":
        {
            "contactSurface": "Carbon steel G10100 (generic)",
            "flowType": "approximateMultiPhaseFlow",
            "pipeDiameter": {
                "value": 10.0,
                "unit": "cm"
            },
            "liquidFlowInPipe": {
                "value": 0.2,
                "unit": "m3/s"
            },
            "gasFlowInPipe": {
                "value": 0.1,
                "unit": "m3/s"
            },
            "pipeRoughness": {
                "value": 0.15,
                "unit": "cm"
            },
            "viscAbs2ndLiq": {
                "value": 15.0,
                "unit": "cP"
            },
            "waterCutAtPointOfDispersionInversion": 0.7,
            "maxRelViscosityOfDispersionAtInversion": 10.0
        },
        ...<snip>...
}

params.corrosionParameters	type	description
pipeDiameter	valueObject	pipe diameter and unit
liquidFlowInPipe	valueObject	liquid flow in pipe and unit
gasFlowInPipe	valueObject	gas flow in pipe and unit
pipeRoughness	valueObject	pipe roughness and unit
viscAbs2ndLiq	valueObject	absolute viscosity of 2nd liquid and unit
waterCutAtPointOfDispersionInversion	number	water cut at point of dispersion inversion
maxRelViscosityOfDispersionAtInversion	number	max relative viscosity of dispersion at inversion

in addition to the inputs shown above some optional properties may also be specified. They can be viewed here

Response (status = "PROCESSED")

{
    "code": 200,
    "data": {
        "result": {
           ...<snip>...
            "corrosionOutputs": {
                "corrosionPotential": {
                    "value": -0.2751504098799078,
                    "unit": "V (SHE)"
                },
                "repassivationPotential": {
                    "value": -0.4851063187462839,
                    "unit": "V (SHE)"
                },
                "corrosionRateGPerMsqDay": {
                    "value": 382.2467320945027,
                    "unit": "g/m3-day"
                },
                "corrosionRateMmPerYear": {
                    "value": 17.728088591422296,
                    "unit": "mm/yr"
                },
                "corrosionRateMilPerYear": {
                    "value": 697.9562437567834,
                    "unit": "mil/yr"
                },
                "corrosionCurrentDensity": {
                    "value": 15.288766842782513,
                    "unit": "A/sq-m"
                },
                "maximumPitCurrentDensity": {
                    "value": 23.87887042448192,
                    "unit": "A/sq-m"
                }
            }
        }
    }, 
    "message": "Results returned successfully", 
    "status": "PROCESSED"
}

The output of this calculation is the stream output which is common result output for all OLI's flash calculations or an error. In addition to this output the the corrosion output information can be conveniently retrieved from the data.result.corrosionOutputs array

data.result.corrosionOutputs	type	description
corrosionPotential	valueObject	corrosion potential
repassivationPotential	valueObject	repassivation potential
corrosionRateGPerMsqDay	valueObject	corrosion rate in gram per cubic meter day
corrosionRateMmPerYear	valueObject	corrosion rate in mm per year
corrosionRateMilPerYear	valueObject	corrosion rate in mil per year
corrosionCurrentDensity	valueObject	corrosion current density
maximumPitCurrentDensity	valueObject	maximum pit current density

All output units are fixed to what is shown in this example

Survey Calculation

Survey calculation is supported for the variables below. Please refer to Survey calculation for explained input schema.

supported params.surveyInputs[{}].field

"/params/temperature/value"

"/params/pressure/value"