Struct PittingModel 

pub struct PittingModel {
    pub e_pit: f64,
    pub e_rp: f64,
    pub critical_chloride: f64,
    pub pit_growth_k: f64,
}

Pitting corrosion model.

Characterised by the pitting potential Epit (onset of stable pitting) and the repassivation potential Erp (below which pits repassivate).

Fields

e_pit: f64

Pitting potential [V vs SHE]: above this potential, stable pits nucleate.

e_rp: f64

Repassivation potential [V vs SHE]: below this, active pits repassivate.

critical_chloride: f64

Critical chloride concentration for pitting [mol/L].

pit_growth_k: f64

Pit growth rate constant k [m·s⁻¹·(A/m²)⁻¹].

Implementations

impl PittingModel

pub fn new( e_pit: f64, e_rp: f64, critical_chloride: f64, pit_growth_k: f64, ) -> Self

Create a new pitting model.

pub fn hysteresis_width(&self) -> f64

Hysteresis width: Epit − Erp [V].

A larger value indicates greater susceptibility to stable pitting.

pub fn is_pitting_active(&self, e: f64) -> bool

Returns true if stable pit growth is expected at the given potential.

pub fn will_repassivate(&self, e: f64) -> bool

Returns true if an active pit will repassivate at potential e.

pub fn pit_radius( &self, i_pit: f64, t: f64, molar_mass: f64, n: f64, density: f64, ) -> f64

Hemispherical pit radius [m] after time t [s] at pit current i_pit [A/m²].

Uses Faraday’s law: V = M·Q/(n·F·ρ) with hemispherical geometry. r = (3·M·i_pit·t / (2·π·n·F·ρ))^(1/3)

Arguments

• i_pit – pit current density [A/m²]
• t – time [s]
• molar_mass – [g/mol]
• n – electrons per atom
• density – [g/cm³]

pub fn induction_time( &self, chloride_conc: f64, material_constant_s: f64, ) -> Option<f64>

Pitting initiation time [s] according to a simplified induction model.

t_i = A / (c_Cl / c_crit − 1) where A is a material constant [s].

Trait Implementations

impl Clone for PittingModel

fn clone(&self) -> PittingModel

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PittingModel

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.